Fruit Research Institute is located at which district in Bihar?

The correct answer is option (A), Gaya.

The Fruit Research Institute is located at Sabour, Gaya district in Bihar. It was established in 1962. The institute is engaged in research and development of fruits and vegetables. It also provides training to farmers and extension workers.

The other options are incorrect. Option (B), Patna, is the capital of Bihar. Option (C), Purnea, is a district in Bihar. Option (D), Bhagalpur, is a district in Bihar.