Question: who does zac efron play in high school musical
[{'answer': 'Zac Efron', 'provenance': [{'wikipedia_id': '22857478', 'title': 'List of High School Musical characters', 'start_paragraph_id': 6, 'start_character': 47, 'end_paragraph_id': 6, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::Main cast.:Troy Bolton.\n'}]}, {'provenance': [{'wikipedia_id': '22857478', 'title': 'List of High School Musical characters', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 686, 'bleu_score': 0.9618830282233141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9100163904893660714}, 'section': 'Section::::Main cast.:Troy Bolton.\n'}]}]