Question: who is the tallest player that ever played in the nba
[{'answer': 'Yao Ming', 'provenance': [{'wikipedia_id': '28754077', 'title': 'List of tallest players in National Basketball Association history', 'start_paragraph_id': 2, 'start_character': 251, 'end_paragraph_id': 2, 'end_character': 259, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28754077', 'title': 'List of tallest players in National Basketball Association history', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 386, 'bleu_score': 0.520952133656392, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2071637274384047124}, 'section': 'Section::::Abstract.'}]}]