Question: who is the chairman of commission on audit
[{'answer': 'Michael G. Aguinaldo', 'provenance': [{'wikipedia_id': '16508765', 'title': 'Commission on Audit of the Philippines', 'start_paragraph_id': 31, 'start_character': 22, 'end_paragraph_id': 31, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::Members.\n'}]}]