Question: who was charged in the my lai massacre
[{'answer': 'William Laws Calley Jr.', 'provenance': [{'wikipedia_id': '80110', 'title': 'William Calley', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '80110', 'title': 'William Calley', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 914, 'bleu_score': 0.9347262087402131, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5969163237096322135}, 'section': 'Section::::Abstract.'}]}]