Question: what is the altitude of big bear california
[{'answer': '6,750 ft'}, {'provenance': [{'wikipedia_id': '536529', 'title': 'Big Bear Lake', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 532, 'bleu_score': 0.6892548060506241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14449643981232359736}, 'section': 'Section::::Abstract.'}]}]