Question: who was the british commander in boston in 1775
[{'answer': 'William Howe', 'provenance': [{'wikipedia_id': '239035', 'title': 'Siege of Boston', 'start_paragraph_id': 3, 'start_character': 455, 'end_paragraph_id': 3, 'end_character': 467, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '239035', 'title': 'Siege of Boston', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 613, 'bleu_score': 0.895301299792273, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14190798413224020413}, 'section': 'Section::::Abstract.'}]}]