Q. Forest Research Institute is at

Explanation by: Mr. Dubey

The Forest Research Institute is a premier institution in India for forestry research and education.
It was established during British rule in 1906 and is situated in Dehradun, Uttarakhand.
Dehradun was chosen because of its proximity to the Himalayan forests and diverse forest ecosystems, making it an ideal location for forestry research.
The institute conducts scientific research on forest conservation, ecology, and management, and also offers educational programs in forestry.

Why not the other options?
(A) Mumbai is a major metropolitan city but not known for forestry research.
(B) Cambay (now called Khambhat) is in Gujarat and is not related to forestry research.
(D) Simla (Shimla) is a hill station but the Forest Research Institute is not located there.

Thus, Dehradun is the correct answer.