Question: how many floors in the john hancock tower boston
[{'answer': '60', 'provenance': [{'wikipedia_id': '465616', 'title': 'John Hancock Tower', 'start_paragraph_id': 2, 'start_character': 323, 'end_paragraph_id': 2, 'end_character': 325, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]