The correct answer is option 3: The Speaker.

In the Lok Sabha, which is the lower house of the Indian Parliament, the Chairman is referred to as the Speaker. The Speaker is responsible for conducting the sessions of the Lok Sabha and maintaining order and decorum. They also have the authority to interpret the rules of procedure and make decisions on matters related to parliamentary proceedings.

Option 1: The President is the head of state in India and is not directly involved in the day-to-day functioning of the Lok Sabha.

Option 2: The Minister of Parliamentary Affairs is responsible for coordinating the legislative business of the government in the Parliament but does not hold the position of the Chairman of the Lok Sabha.

Option 4: The Prime Minister is the head of the government in India and does not hold the position of the Chairman of the Lok Sabha.

Therefore, option 3: The Speaker is the correct answer.