How many active volcanoes are there in California?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q99', 'id': 0, 'label': 'California'}, {'type': 'INTERNAL', 'name_': 'Q20970432', 'id': 1, 'label': '4:3'}, {'type': 'INTERNAL', 'name_': 'Q1196933', 'id': 2, 'label': 'The Son of the Sheik'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q202', 'id': 3, 'label': '4'}], 'links': [{'name_': 'P4934', 'source': 1, 'target': 3, 'label': 'calculated from'}, {'name_': 'P915', 'source': 2, 'target': 0, 'label': 'filming location'}, {'name_': 'P2061', 'source': 2, 'target': 1, 'label': 'aspect ratio (W:H)'}]}