Question: when did helmets become mandatory in the tour de france
[{'answer': 'October 2003', 'provenance': [{'wikipedia_id': '1022530', 'title': 'Andrey Kivilev', 'start_paragraph_id': 7, 'start_character': 781, 'end_paragraph_id': 7, 'end_character': 793, 'bleu_score': 1.0, 'section': 'Section::::Legacy.\n'}]}, {'provenance': [{'wikipedia_id': '1022530', 'title': 'Andrey Kivilev', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 985, 'bleu_score': 0.988472140978305, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16383206154311593113}, 'section': 'Section::::Legacy.\n'}]}]