Question: when was the marine mammal protection act passed
[{'answer': 'October 21 , 1972', 'provenance': [{'wikipedia_id': '3550910', 'title': 'Marine Mammal Protection Act', 'start_paragraph_id': 3, 'start_character': 28, 'end_paragraph_id': 3, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Authority.\n'}]}, {'provenance': [{'wikipedia_id': '3550910', 'title': 'Marine Mammal Protection Act', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 903, 'bleu_score': 0.8102142827126301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12856113131677829482}, 'section': 'Section::::Authority.\n'}]}]