Who sold more records, Beyoncé or Katy Perry?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q4167836', 'id': 1, 'label': 'Wikimedia category'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q36153', 'id': 2, 'label': 'Beyoncé'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q42493', 'id': 3, 'label': 'Katy Perry'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q26241026', 'id': 4, 'label': 'Category:Films directed by Beyoncé'}, {'type': 'INTERNAL', 'name_': 'Q7966868', 'id': 5, 'label': 'Category:Katy Perry'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P27', 'source': 2, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P7084', 'source': 2, 'target': 4, 'label': 'related category'}, {'name_': 'P27', 'source': 3, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P910', 'source': 3, 'target': 5, 'label': "topic's main category"}, {'name_': 'P31', 'source': 4, 'target': 1, 'label': 'instance of'}, {'name_': 'P971', 'source': 4, 'target': 2, 'label': 'category combines topics'}, {'name_': 'P31', 'source': 5, 'target': 1, 'label': 'instance of'}, {'name_': 'P301', 'source': 5, 'target': 3, 'label': "category's main topic"}]}