Question: who calls the pitches in major league baseball
[{'answer': 'umpire', 'provenance': [{'wikipedia_id': '54395', 'title': 'Strike zone', 'start_paragraph_id': 1, 'start_character': 334, 'end_paragraph_id': 1, 'end_character': 340, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54395', 'title': 'Strike zone', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 174, 'bleu_score': 0.8547305998833801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3610769549895411814}, 'section': 'Section::::Enforcement.\n'}]}]