The correct answer is: A. Ram Dayalu Singh
Ram Dayalu Singh was the first speaker of Bihar Legislative Assembly. He was a member of the Indian National Congress and served as the speaker from 1947 to 1952. He was born in 1892 in the village of Singheshwar in the Saran district of Bihar. He was educated at the local schools and then at the Patna University, where he obtained a degree in law. He started his career as a lawyer and then entered politics. He was elected to the Bihar Legislative Assembly in 1937 and served as a minister in the government of Shri Krishna Sinha. He was a close associate of Mahatma Gandhi and Jawaharlal Nehru. He died in 1968.
The other options are incorrect.
- Option B: Bindeshwari Pandit Sharma was a member of the Communist Party of India and served as the speaker of Bihar Legislative Assembly from 1952 to 1957.
- Option C: Laxminarayan Sudhakar was a member of the Janata Party and served as the speaker of Bihar Legislative Assembly from 1977 to 1980.
- Option D: Dhanik Lal Mandal was a member of the Rashtriya Janata Dal and served as the speaker of Bihar Legislative Assembly from 1990 to 1995.