Question: when was the city of san francisco founded
[{'answer': 'June 29 , 1776', 'provenance': [{'wikipedia_id': '49728', 'title': 'San Francisco', 'start_paragraph_id': 3, 'start_character': 29, 'end_paragraph_id': 3, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49728', 'title': 'San Francisco', 'start_paragraph_id': 3, 'start_character': 14, 'end_paragraph_id': 3, 'end_character': 1308, 'bleu_score': 0.8588856472835581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 320036836330122618}, 'section': 'Section::::Abstract.'}]}]