Explanation:

- Option 1: Parliament

The President of India can be removed by an impeachment process that involves both Houses of Parliament. The process is detailed and requires a two-thirds majority.

- Option 2: Chief Justice of India

The Chief Justice of India does not have the power to remove the President. Their role is judicial, not directly involved in impeachment.

- Option 3: Prime Minister

The Prime Minister does not have the authority to remove the President. This power is not vested in an individual executive role.

- Option 4: Lok Sabha

The Lok Sabha alone cannot remove the President. The impeachment process requires participation from both the Lok Sabha and the Rajya Sabha.