Question: who was the first chief minister of west bengal
[{'answer': 'Prafulla Chandra Ghosh', 'provenance': [{'wikipedia_id': '2382949', 'title': 'List of chief ministers of West Bengal', 'start_paragraph_id': 2, 'start_character': 218, 'end_paragraph_id': 2, 'end_character': 240, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Prafulla Chandra Ghosh of the Indian National Congress'}, {'provenance': [{'wikipedia_id': '2382949', 'title': 'List of chief ministers of West Bengal', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ["In August 1947, the British Indian province of Bengal was partitioned into the Pakistani province of East Bengal and the Indian state of West Bengal. Since then West Bengal has had eight chief ministers, starting with Prafulla Chandra Ghosh of the Indian National Congress (INC) party. His five-month stint as Prime Minister of West Bengalas the office was known until January 1950was succeeded by the 14-year reign of colleague Bidhan Chandra Roy, whose death in 1962 led to Prafulla Chandra Sen serving out the remainder of his term. A period of political instability followedWest Bengal witnessed three elections, four coalition governments and three stints of President's rule between 1967 and 1972before Siddhartha Shankar Ray of the INC served a five-year term.", 'Since then West Bengal has had eight chief ministers, starting with Prafulla Chandra Ghosh of the Indian National Congress (INC) party.', 'Since then West Bengal has had eight chief ministers, starting with Prafulla Chandra Ghosh of the Indian National Congress (INC) party. His five-month stint as Prime Minister of West Bengalas the office was known until January 1950was succeeded by the 14-year reign of colleague Bidhan Chandra Roy, whose death in 1962 led to Prafulla Chandra Sen serving out the remainder of his term.']}}]}, {'provenance': [{'wikipedia_id': '34040', 'title': 'West Bengal', 'section': 'Section::::Education.\n', 'start_paragraph_id': 102, 'end_paragraph_id': 102, 'meta': {'evidence_span': ['Cyclotron Centre are the most prominent. Notable scholars who were born, worked, or studied in the geographic area of the state include physicists Satyendra Nath Bose, Meghnad Saha, and Jagadish Chandra Bose; chemist Prafulla Chandra Roy; statisticians Prasanta Chandra Mahalanobis and Anil Kumar Gain; physician Upendranath Brahmachari; educator Ashutosh Mukherjee; and Nobel laureates Rabindranath Tagore, C. V. Raman, and Amartya Sen. In 2005 West Bengal had 505 published newspapers, of which 389 were in Bengali. "Ananda Bazar Patrika", published from Kolkata with 1,277,801', 'otable scholars who were born, worked, or studied in the geographic area of the state include physicists Satyendra Nath Bose, Meghnad Saha, and Jagadish Chandra Bose; chemist Prafulla Chandra Roy']}}]}]