Question: when was the battle of plassey was fought
[{'answer': 'on 23 June 1757', 'provenance': [{'wikipedia_id': '413064', 'title': 'Battle of Plassey', 'start_paragraph_id': 1, 'start_character': 126, 'end_paragraph_id': 1, 'end_character': 141, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '413064', 'title': 'Battle of Plassey', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 310, 'bleu_score': 0.860741734480653, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17416006023829615781}, 'section': 'Section::::Abstract.'}]}]