Question: what is the name of the tower big ben is in
[{'answer': 'Elizabeth Tower', 'provenance': [{'wikipedia_id': '7290308', 'title': 'Big Ben', 'start_paragraph_id': 1, 'start_character': 294, 'end_paragraph_id': 1, 'end_character': 309, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7290308', 'title': 'Big Ben', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 361, 'bleu_score': 0.9716239638199891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13288711869297657091}, 'section': 'Section::::Abstract.'}]}]