Name the Vedic saint associated with the Renuka lake in Sirmaur district of Himachal Pradesh.

The correct answer is Rishi Jamdagni.

Rishi Jamdagni was a Vedic sage who lived in the Himalayas. He was the father of Parashurama, one of the most powerful warriors in Hindu mythology. Rishi Jamdagni was also the founder of the Jamdagni Sampradaya, one of the most important Vedic schools.

The Renuka lake is located in the Sirmaur district of Himachal Pradesh. It is a sacred lake that is associated with Rishi Jamdagni. According to legend, Rishi Jamdagni used to perform his penance at the Renuka lake. He also used to bathe in the lake to purify himself.

The Renuka lake is a popular tourist destination. It is also a popular pilgrimage destination for Hindus.