The correct option is D Pawan Chamling
On April 29, Pawan Chamling has created history by becoming the longest serving chief minister in India. He surpassed the record of former communist ruler of West Bengal, Late Jyoti Basu. Chamling became the chief minister of Sikkim on 12th December 1994 and has ruled the tiny Himalayan state ever since. He is also the president of Sikkim Democratic Front (SDF). Chamling, who also writes poetry, joined politics in 1973 and was elected to the Sikkim assembly for the first time in 1985. The assembly elections will be held in Sikkim in 2019.