Question: who was the leader of the small american militia force in lexington
[{'answer': 'Captain John Parker', 'provenance': [{'wikipedia_id': '4321886', 'title': 'Battles of Lexington and Concord', 'start_paragraph_id': 36, 'start_character': 402, 'end_paragraph_id': 36, 'end_character': 421, 'bleu_score': 1.0, 'section': 'Section::::The Battles.:Lexington.\n'}]}, {'provenance': [{'wikipedia_id': '4321886', 'title': 'Battles of Lexington and Concord', 'start_paragraph_id': 36, 'start_character': 0, 'end_paragraph_id': 36, 'end_character': 971, 'bleu_score': 0.9816505100793371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7957010787706703513}, 'section': 'Section::::The Battles.:Lexington.\n'}]}]