The president of a country usually addresses both Houses of Parliament assembled together on certain occasions. These occasions are as follows:

First Session after General Election and First Session of Each Year:
The president addresses both Houses of Parliament assembled together during the first session after each general election and the first session of each year. This is an important constitutional requirement as it allows the president to outline the government's policies and agenda for the upcoming year. It serves as an opportunity for the president to address the nation and highlight the priorities of the government.

Emergency Session Summoned for the Purpose:
In cases of emergencies or special circumstances, a session of both Houses of Parliament may be summoned by the president. During such emergency sessions, the president addresses both Houses to discuss and address the pressing issues at hand. This could include matters related to national security, economic crises, or any other urgent matters that require immediate attention.

Every Session:
While the president does not address both Houses of Parliament assembled together in every session, there are instances where the president may choose to address the Parliament during regular sessions. These addresses are usually reserved for important policy announcements, updates on the government's progress, or other significant national issues that need to be communicated to the members of Parliament and the public.

Conclusion:
In conclusion, the president addresses both Houses of Parliament assembled together during the first session after each general election and the first session of each year. Additionally, the president may also address both Houses during emergency sessions or on specific occasions when important national matters need to be discussed. These addresses provide an opportunity for the president to communicate the government's agenda, policies, and priorities to the members of Parliament and the public.

Explanation:
The question asks when the President addresses both Houses of Parliament assembled together. The correct answer is option C, which states that the President addresses both Houses during the first session after each general election and the first session of each year.
Here's a detailed explanation:
First Session after each General Election:
- After a general election, the President addresses both Houses of Parliament assembled together.
- This is an important occasion for the President to outline the government's policy agenda and priorities for the upcoming term.
- It allows the President to set the tone for the legislative agenda and provide guidance to the Members of Parliament.
First Session of each Year:
- The President also addresses both Houses of Parliament assembled together at the beginning of each year.
- This address serves as an opportunity for the President to review the achievements and challenges of the previous year.
- It also allows the President to highlight the government's plans and priorities for the upcoming year.
- This address sets the stage for the legislative agenda and provides a roadmap for the functioning of Parliament in the coming year.
Significance of the President's Address:
- The President's address to both Houses of Parliament is significant as it represents the executive's vision and agenda.
- It allows the President to communicate directly with the Members of Parliament and the people of the country.
- The address provides a comprehensive overview of the government's plans, policies, and initiatives.
- It is an important event in the functioning of Parliament and sets the tone for the legislative activities for the session or year.
In conclusion, the President addresses both Houses of Parliament assembled together during the first session after each general election and the first session of each year. These addresses are significant as they provide an opportunity for the President to outline the government's agenda and priorities.