Tocklai Tea Experiment Station is located at:

Correct option is D

Tocklai Tea Research Institute, located in Jorhat, Assam, is the world's oldest and largest tea research center. Established in 1911, it conducts research on tea breeding, cultivation techniques, pest management, and processing methods. Assam is a major tea-producing region in India, and Tocklai plays a crucial role in improving tea quality and yield.