Question: who blew up the bridge in harry potter
[{'answer': 'Lord Voldemort', 'provenance': [{'wikipedia_id': '858575', 'title': 'Harry Potter and the Half-Blood Prince (film)', 'start_paragraph_id': 1, 'start_character': 503, 'end_paragraph_id': 1, 'end_character': 517, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '858575', 'title': 'Harry Potter and the Half-Blood Prince (film)', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 639, 'bleu_score': 0.849141143709991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2350385712348902642}, 'section': 'Section::::Plot.\n'}]}]