Correct Answer: (b) Pawan Chamling
Solution:According to the information received till April, 2019, the name of the person who has held the post of Chief Minister of any state in India for the longest time is Pawan Chamling. He was the Chief Minister of Sikkim for five consecutive terms from 1994 to May 2019. The present Chief Minister of Sikkim is Prem Singh Tamang (PS Gole).