Introduction:
The Constitution of India provides for a parliamentary form of government wherein the President is the head of the state and the Prime Minister is the head of the government. The President has certain powers and functions, one of which is to give his assent to bills passed by the Parliament.

Explanation:
Some bills require the prior permission/consent/recommendation of the President to be introduced. However, such recommendations are required in specific legislative cases.

a) Making provision for the reduction or abolition of any tax: Bills that make provision for the reduction or abolition of any tax require the prior permission/consent/recommendation of the President to be introduced. This is because such bills may have a significant impact on the revenue of the government, and the President needs to be consulted before such bills are introduced.

b) For alteration of areas of the existing States: Bills that seek to alter the areas of the existing states also require the prior permission/consent/recommendation of the President to be introduced. This is because such bills may have significant political and administrative implications, and the President needs to be consulted before such bills are introduced.

c) For changing the official language of the Parliament: Bills that seek to change the official language of the Parliament also require the prior permission/consent/recommendation of the President to be introduced. This is because the official language of the Parliament is a matter of national importance, and any change to it needs to be approved by the President.

d) All the above cases require prior Presidential assent: This statement is incorrect as only option a) requires prior Presidential assent. Options b) and c) also require prior Presidential permission/recommendation, but not assent.

Conclusion:
In conclusion, bills that make provision for the reduction or abolition of any tax require the prior permission/consent/recommendation of the President to be introduced. Other bills may also require prior Presidential permission/recommendation, but not necessarily assent.