Question: when does the clock change from am to pm
[{'answer': '12 noon', 'provenance': [{'wikipedia_id': '241267', 'title': '12-hour clock', 'start_paragraph_id': 1, 'start_character': 429, 'end_paragraph_id': 1, 'end_character': 436, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '241267', 'title': '12-hour clock', 'start_paragraph_id': 1, 'start_character': 12, 'end_paragraph_id': 1, 'end_character': 624, 'bleu_score': 0.7322951787665061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5395891700513904400}, 'section': 'Section::::Abstract.'}]}]