Question: who is the coach for north carolina basketball
[{'answer': 'Roy Williams', 'provenance': [{'wikipedia_id': '1443264', 'title': 'Roy Williams (basketball coach)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]