What is the capital of India?

New Delhi serves as the capital of India, which makes it the correct response to the question. Established as the capital during British rule, New Delhi officially became the capital of India after the country gained independence in 1947. It is an essential political hub, housing key government buildings, the President's residence, and other significant institutions related to India's governance.

Mumbai, Bangalore, and Kolkata, while major cities, do not hold the status of the national capital. Mumbai is known as the financial capital, Bangalore is often referred to as the Silicon Valley of India due to its technology sector, and Kolkata is recognized for its rich culture and history. Each city has its unique significance, but none serves as the administrative center of the government, which is why New Delhi is the correct answer in this context.