Who is the leader of the country that was the source of Covid-19?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q6256', 'id': 0, 'label': 'country'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q84263196', 'id': 1, 'label': 'COVID-19'}, {'type': 'INTERNAL', 'name_': 'Q7275', 'id': 2, 'label': 'state'}, {'type': 'INTERNAL', 'name_': 'Q530', 'id': 3, 'label': 'Ingemar Stenmark'}, {'type': 'INTERNAL', 'name_': 'Q109880883', 'id': 4, 'label': 'Poverty in the time of covid: the effect of social assistance'}], 'links': [{'name_': 'P460', 'source': 0, 'target': 2, 'label': 'said to be the same as'}, {'name_': 'P1963', 'source': 0, 'target': 3, 'label': 'properties for this type'}, {'name_': 'P1889', 'source': 2, 'target': 0, 'label': 'different from'}, {'name_': 'P1963', 'source': 2, 'target': 3, 'label': 'properties for this type'}, {'name_': 'P921', 'source': 4, 'target': 1, 'label': 'main subject'}, {'name_': 'P921', 'source': 4, 'target': 2, 'label': 'main subject'}]}