Govind Ballabh Pant Sagar, the largest man made lake in India by area, is the reservoir of which dam?

The correct answer is B, the Rihand dam. The dam was built at Pipri in Sonbhadra district across the Rihand, a tributary of the Son, and the lake behind it was named Govind Ballabh Pant Sagar after the first chief minister of Uttar Pradesh. By surface area it is the largest artificial lake in the country, and its water serves irrigation, hydel generation and the cooling needs of the thermal stations crowded around it.

Option A, Matatila, is a dam on the Betwa in the Jhansi and Lalitpur tract, shared with Madhya Pradesh. Option C, the Ramganga dam at Kalagarh, stores water for Moradabad, Rampur, Bareilly and Budaun and lies at the edge of the Corbett forests. Option D, Rajghat, is another Betwa project shared with Madhya Pradesh. All four are real reservoirs of the state, so the question turns on the single phrase largest man made lake, which belongs to Rihand.