Question: where is the time zone change from eastern to central
[{'answer': '49 CFR 71', 'provenance': [{'wikipedia_id': '496028', 'title': 'Eastern Time Zone', 'start_paragraph_id': 16, 'start_character': 173, 'end_paragraph_id': 16, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::United States.\n'}]}, {'provenance': [{'wikipedia_id': '496028', 'title': 'Eastern Time Zone', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 182, 'bleu_score': 0.9364250605898111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16699493196127892485}, 'section': 'Section::::United States.\n'}]}]