The 102′ Indian Science Congress. held during 3-7 January was hosted by :-

J.N.U. New Delhi
Kolkata University
Mumbai University
Patna University

The correct answer is (a) J.N.U. New Delhi.

The 102nd Indian Science Congress was held from January 3 to 7, 2023, at the Jawaharlal Nehru University in New Delhi. The theme of the conference was “Science for the Nation’s Development.” The conference was attended by over 10,000 scientists from India and abroad.

The Indian Science Congress is an annual event that is held in a different city in India each year. The conference is organized by the Indian National Science Academy (INSA). The INSA is a non-profit organization that is dedicated to promoting science and technology in India.

The Indian Science Congress is a major event in the Indian scientific community. The conference provides a platform for scientists to present their research and to network with other scientists. The conference also features a number of plenary lectures and symposia on important scientific topics.

The 102nd Indian Science Congress was a successful event. The conference provided a valuable opportunity for scientists to share their research and to network with other scientists. The conference also helped to promote science and technology in India.

The other options are incorrect because they are not the cities where the 102nd Indian Science Congress was held.