Question: what was the magnitude of the 1989 san francisco earthquake
[{'answer': '6.9', 'provenance': [{'wikipedia_id': '261671', 'title': '1989 Loma Prieta earthquake', 'start_paragraph_id': 1, 'start_character': 359, 'end_paragraph_id': 1, 'end_character': 362, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '261671', 'title': '1989 Loma Prieta earthquake', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 738, 'bleu_score': 0.847290592614879, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1405568193111843037}, 'section': 'Section::::Abstract.'}]}]