Famous folk singers from Bihar include:

Sharda Sinha
Bharat Sharma Vyas
Guddu Rangeela
Pandit Bhimsen Joshi

The correct answer is Sharda Sinha.

Sharda Sinha is an Indian folk singer from Bihar. She is known for her renditions of Bhojpuri folk songs. She has won several awards, including the Padma Shri, the fourth highest civilian award in India.

Bharat Sharma Vyas is a Hindi poet and writer from Bihar. He is known for his works on social and political issues. He has won several awards, including the Sahitya Akademi Award.

Guddu Rangeela is an Indian actor and comedian from Bihar. He is known for his work in Bhojpuri films and television. He has won several awards, including the Zee Cine Award for Best Actor in a Bhojpuri Film.

Pandit Bhimsen Joshi was an Indian classical singer from Karnataka. He was known for his renditions of Hindustani classical music. He was awarded the Bharat Ratna, the highest civilian award in India.

Sharda Sinha is the most famous folk singer from Bihar. She is known for her renditions of Bhojpuri folk songs. She has won several awards, including the Padma Shri, the fourth highest civilian award in India.