Question: when did 21 cfr part 11 become effective
[{'answer': '1997', 'provenance': [{'wikipedia_id': '7613634', 'title': 'Title 21 CFR Part 11', 'start_paragraph_id': 25, 'start_character': 428, 'end_paragraph_id': 25, 'end_character': 432, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '7613634', 'title': 'Title 21 CFR Part 11', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 96, 'bleu_score': 0.740341801138923, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12601089765917240968}, 'section': 'Section::::History.\n'}]}]