What is the continent, besides Antarctica, that has never hosted the Olympics?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q19180675', 'id': 0, 'label': 'Small Brockhaus and Efron Encyclopedic Dictionary'}, {'type': 'INTERNAL', 'name_': 'Q145', 'id': 1, 'label': 'United Kingdom'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q51', 'id': 2, 'label': 'Antarctica'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q6906', 'id': 3, 'label': 'UTC+06:00'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q5389', 'id': 4, 'label': 'Olympic Games'}], 'links': [{'name_': 'P1343', 'source': 1, 'target': 0, 'label': 'described by source'}, {'name_': 'P17', 'source': 1, 'target': 1, 'label': 'country'}, {'name_': 'P421', 'source': 1, 'target': 3, 'label': 'located in time zone'}, {'name_': 'P1343', 'source': 2, 'target': 0, 'label': 'described by source'}, {'name_': 'P421', 'source': 2, 'target': 3, 'label': 'located in time zone'}, {'name_': 'P1343', 'source': 4, 'target': 0, 'label': 'described by source'}]}