Introduction:
The Indian Constitution has four pillars: the legislature, the executive, the judiciary, and the fourth estate. The fourth estate, or the fourth pillar of the constitution, is the media, which plays a crucial role in informing and educating the public and holding the government accountable. However, this question is not about the fourth estate, but about the fourth pillar of the constitution, which is an important constitutional office.

Answer:
The answer to this question is (c) Advocate General. The Advocate General is the fourth pillar of the Indian Constitution, and his or her role is crucial in safeguarding the constitutional rights of the citizens of India. In this answer, we will discuss who the Advocate General is, what his or her role is, and why he or she is considered the fourth pillar of the constitution.

Who is the Advocate General?
The Advocate General is a constitutional office created by Article 165 of the Indian Constitution. He or she is the chief legal advisor to the government of a state and is appointed by the Governor of the state. The Advocate General is a lawyer who has been practicing law for at least ten years and is qualified to be appointed as a judge of a High Court.

What is the role of the Advocate General?
The role of the Advocate General is to provide legal advice to the government of a state. He or she also represents the government in legal matters and defends the government in court. The Advocate General is responsible for ensuring that the government follows the rule of law and does not violate the constitutional rights of the citizens of the state.

Why is the Advocate General considered the fourth pillar of the constitution?
The Advocate General is considered the fourth pillar of the constitution because he or she plays a crucial role in safeguarding the constitutional rights of the citizens of India. The Advocate General ensures that the government of a state does not violate the constitutional rights of the citizens and follows the rule of law. The Advocate General is also responsible for ensuring that the government is held accountable for its actions. This is why the Advocate General is considered the fourth pillar of the constitution, along with the legislature, the executive, and the judiciary.

Conclusion:
The Advocate General is an important constitutional office in India and plays a crucial role in safeguarding the constitutional rights of the citizens of India. The Advocate General is the fourth pillar of the constitution and ensures that the government follows the rule of law and is held accountable for its actions.