The correct answer is the Chief Justice of India.

• The Chief Justice of India conducts the Oath of Office for the President of India.

• Article 60: Oath and Affirmation of the President.
  • The oath of the President is administered by the Chief Justice of India and in his absence, the seniormost Judge of the Supreme Court. 
• The Electoral College for the president consists of:
  • The elected members of both Houses of Parliament;
  • The elected members of the Legislative Assemblies of the states; and
  • The elected members of the Legislative Assemblies of Union Territories of Delhi and Pondicherry (now Puducherry).
• Qualification of the President:
  • Under Article 58, a person to be eligible for election as President should fulfill the following qualifications:
  • He should be a citizen of India.
  • He should have completed 35 years of age.
  • He should be qualified for election as a member of the Lok Sabha.
  • He should not hold any office of profit under the Union Government or any State Government or any local authority or any other public authority.

• The President conducts the Oath of Office for the Prime Minister of India.
• The Attorney General of India is appointed by the President.
• The President conducts the Oath of Office for the Vice President of India.