The Chairman of the GST Council is

President of India
Union Finance Minister
Comptroller and Auditor General of India
Prime Minister of India

The correct answer is (b) Union Finance Minister.

The GST Council is a statutory body constituted under the Goods and Services Tax Act, 2017. It is chaired by the Union Finance Minister and has state finance ministers as members. The Council is responsible for making recommendations to the Central Government on matters relating to GST, including rates, exemptions, and other aspects of the tax.

The President of India is the head of state of India. The Union Finance Minister is the head of the Ministry of Finance and is responsible for the formulation and implementation of the country’s fiscal policy. The Comptroller and Auditor General of India is the head of the Indian Audit and Accounts Department and is responsible for auditing the accounts of the Central Government and state governments. The Prime Minister of India is the head of the government of India and is responsible for the day-to-day administration of the country.

The Union Finance Minister is the most appropriate person to chair the GST Council because he/she is responsible for the formulation and implementation of the country’s fiscal policy. The GST Council is responsible for making recommendations to the Central Government on matters relating to GST, including rates, exemptions, and other aspects of the tax. The Union Finance Minister is the best person to make these recommendations because he/she has the necessary expertise and experience in fiscal policy.