What is the most sold game on Steam of all time?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q337535', 'id': 0, 'label': 'Steam'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q842146', 'id': 1, 'label': 'Counter-Strike: Global Offensive'}, {'type': 'INTERNAL', 'name_': 'Q71481187', 'id': 2, 'label': 'CSGO Blue/Orange'}], 'links': [{'name_': 'P750', 'source': 2, 'target': 0, 'label': 'distributed by'}, {'name_': 'P180', 'source': 2, 'target': 1, 'label': 'depicts'}]}