Mark the best option:
The head of the Union Government in India is
Council of Ministers
The union executive power vests in the President of India and is exercised by him either directly or through his subordinates. The Prime Minister of India, as addressed to in the Constitution of India, is the chief of government, chief adviser to the President of India, head of the Council of Ministers and the leader of the majority party in the parliament. The prime minister leads the executive branch of the Government of India
President is the correct option.