What is the best-selling PC game of all time?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q16338', 'id': 0, 'label': 'personal computer'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q204157', 'id': 1, 'label': 'power supply'}, {'type': 'INTERNAL', 'name_': 'Q8189374', 'id': 2, 'label': 'homebuilt computer'}], 'links': [{'name_': 'P279', 'source': 2, 'target': 0, 'label': 'subclass of'}, {'name_': 'P527', 'source': 2, 'target': 1, 'label': 'has part(s)'}]}