Concept:The first Chief Minister of a state is the head of government chosen after the state's formation.Explanation:Shri Krishna Singh was the first Chief Minister of Bihar. He took office after India's independence. He represented the Basantpur West constituency. He was known as "Bihar Kesari" for his powerful speeches. He was the first Chief Minister in India to abolish the zamindari system. A book titled "Freedom and Beyond" compiles his letters with Prime Minister Jawaharlal Nehru. Deep Narayan Singh became the second Chief Minister. The current Chief Minister is Nitish Kumar from Janata Dal (United), in office since 2015. The other options are incorrect: Satya Pal Malik was a Governor, not a Chief Minister. Nitish Kumar and Rabri Devi were later Chief Ministers, not the first.Answer:A. Shri Krishna Singh