Question: whos the gm of the oakland a's
[{'answer': 'David Forst', 'provenance': [{'wikipedia_id': '2491353', 'title': 'List of Oakland Athletics owners and executives', 'start_paragraph_id': 5, 'start_character': 12, 'end_paragraph_id': 5, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Team executives.\n'}]}]