Passage: Steel Authority of India Limited (SAIL) is an Indian state-owned steel making company based in New Delhi, India. It is a public sector undertaking, owned and operated by the Government of India with an annual turnover of INR 44,452 Crore (US$6.83 Billion) for fiscal year 2016-17. Incorporated on 24 January 1973, SAIL has 72,004 employees (as of 01-May-2019). With an annual production of 14.38 million metric tons, SAIL is the largest steel producer in India and one of the largest steel producers in the world. The Hot Metal production capacity of the company will further increase and is expected to reach a level of 50 million tonnes per annum by 2025. Sri Anil Kumar Chaudhary is the current Chairman of SAIL.

Question: Where is the headquarter of SAIL?
New Delhi, India