Question: who abolished the dual government system in bengal
[{'answer': 'British East India company', 'provenance': [{'wikipedia_id': '2553921', 'title': 'Nawabs of Bengal and Murshidabad', 'start_paragraph_id': 28, 'start_character': 359, 'end_paragraph_id': 28, 'end_character': 385, 'bleu_score': 1.0, 'section': "Section::::History during the Nawab's rule.:Nawabs of Bengal under British rule and their decline.\n"}]}]