Question: who led the colonists at lexington and concord
[{'answer': 'John Parker', 'provenance': [{'wikipedia_id': '4321886', 'title': 'Battles of Lexington and Concord', 'start_paragraph_id': 36, 'start_character': 410, 'end_paragraph_id': 36, 'end_character': 421, 'bleu_score': 1.0, 'section': 'Section::::The Battles.:Lexington.\n'}]}, {'answer': 'James Barrett', 'provenance': [{'wikipedia_id': '4321886', 'title': 'Battles of Lexington and Concord', 'start_paragraph_id': 48, 'start_character': 814, 'end_paragraph_id': 48, 'end_character': 827, 'bleu_score': 1.0, 'section': 'Section::::The Battles.:Concord.\n'}]}, {'answer': 'John Buttrick'}, {'answer': 'John Robinson', 'provenance': [{'wikipedia_id': '4321886', 'title': 'Battles of Lexington and Concord', 'start_paragraph_id': 55, 'start_character': 489, 'end_paragraph_id': 55, 'end_character': 502, 'bleu_score': 1.0, 'section': 'Section::::The Battles.:Concord.:The North Bridge.\n'}]}, {'answer': 'William Heath', 'provenance': [{'wikipedia_id': '4321886', 'title': 'Battles of Lexington and Concord', 'start_paragraph_id': 82, 'start_character': 51, 'end_paragraph_id': 82, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::The Battles.:Return march.:Lexington to Menotomy.\n'}]}, {'answer': 'Joseph Warren', 'provenance': [{'wikipedia_id': '4321886', 'title': 'Battles of Lexington and Concord', 'start_paragraph_id': 18, 'start_character': 62, 'end_paragraph_id': 18, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Background.:American preparations.\n'}]}, {'answer': 'Isaac Davis', 'provenance': [{'wikipedia_id': '4321886', 'title': 'Battles of Lexington and Concord', 'start_paragraph_id': 55, 'start_character': 584, 'end_paragraph_id': 55, 'end_character': 595, 'bleu_score': 1.0, 'section': 'Section::::The Battles.:Concord.:The North Bridge.\n'}]}]