Joint Parliamentary Sessions in India are special sessions where both houses of Parliament, the Rajya Sabha (Upper House) and the Lok Sabha (Lower House), meet together. These sessions are called to address important matters such as passing constitutional amendments, declaring a state of emergency, or impeaching the President.

The question asks who chairs these Joint Parliamentary Sessions. The correct answer is option 3, the Speaker of the Lok Sabha. The Speaker of the Lok Sabha is the presiding officer of the Lower House and is responsible for maintaining order and conducting the proceedings of the House. In the case of a Joint Parliamentary Session, the Speaker exercises this role over both houses, ensuring that the session runs smoothly and all members have the opportunity to participate.

Option 1, President of India, is incorrect. While the President has a significant role in the functioning of Parliament, including summoning and proroguing sessions, they do not chair the Joint Parliamentary Sessions.

Option 2, Vice-President of India who is the Chairman of the Rajya Sabha, is also incorrect. The Vice-President, as the Chairman of the Rajya Sabha, presides over the sessions of the Upper House but does not chair the Joint Parliamentary Sessions.

Option 4, Prime Minister of India, is incorrect as well.