Answer : 4. "Hyderabad"
Explanation :

The head office of India's Insurance Regulatory and Development Authority (IRDAI) is in Hyderabad. 

Insurance Regulatory and Development Authority of India (IRDAI): It was constituted by the recommendations of the Malhotra Committee report, in 1999. 

It is an autonomous body. 

It regulates and develops the insurance industry. 

The IRDA was incorporated as a statutory body in April 2000. Objective: Enhance customer satisfaction through increased consumer choice and lower premiums while ensuring the financial security of the insurance market. 

Today there are 34 general insurance companies and 24 life insurance companies operating in the country.