Question: who is the manager of the washington nationals baseball team
[{'answer': 'David Martinez', 'provenance': [{'wikipedia_id': '3368651', 'title': 'Dave Martinez', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3368651', 'title': 'Dave Martinez', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 565, 'bleu_score': 0.952657101209585, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1846867175874674496}, 'section': 'Section::::Abstract.'}]}]