Question: most of the destruction in san francisco following the earthquake of 1906 happened due to
[{'answer': 'fires', 'provenance': [{'wikipedia_id': '20110714', 'title': '1906 San Francisco earthquake', 'start_paragraph_id': 1, 'start_character': 369, 'end_paragraph_id': 1, 'end_character': 374, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20110714', 'title': '1906 San Francisco earthquake', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 897, 'bleu_score': 0.986797956037998, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12876792621142341623}, 'section': 'Section::::Fires.\n'}]}]