Question: who abolished the dual system of government in bengal
[{'answer': 'the British East India Company', 'provenance': [{'wikipedia_id': '2553921', 'title': 'Nawabs of Bengal and Murshidabad', 'start_paragraph_id': 2, 'start_character': 359, 'end_paragraph_id': 2, 'end_character': 389, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]