What is the first longest river in the world?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q1970746', 'id': 0, 'label': 'Explanatory Dictionary of the Living Great Russian Language'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q4022', 'id': 1, 'label': 'river'}, {'type': 'INTERNAL', 'name_': 'Q102192', 'id': 2, 'label': 'fresh water'}, {'type': 'INTERNAL', 'name_': 'Q29995', 'id': 3, 'label': 'Eurasian otter'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q11710365', 'id': 4, 'label': 'aquatic organism'}, {'type': 'INTERNAL', 'name_': 'Q43142', 'id': 5, 'label': 'lichen'}, {'type': 'INTERNAL', 'name_': 'Q3356145', 'id': 6, 'label': 'freshwater organism'}, {'type': 'INTERNAL', 'name_': 'Q21028481', 'id': 7, 'label': 'aquatic lichens'}], 'links': [{'name_': 'P1343', 'source': 1, 'target': 0, 'label': 'described by source'}, {'name_': 'P1889', 'source': 1, 'target': 1, 'label': 'different from'}, {'name_': 'P2974', 'source': 3, 'target': 1, 'label': 'habitat'}, {'name_': 'P2974', 'source': 3, 'target': 2, 'label': 'habitat'}, {'name_': 'P1343', 'source': 5, 'target': 0, 'label': 'described by source'}, {'name_': 'P2974', 'source': 6, 'target': 2, 'label': 'habitat'}, {'name_': 'P279', 'source': 6, 'target': 4, 'label': 'subclass of'}, {'name_': 'P279', 'source': 7, 'target': 4, 'label': 'subclass of'}, {'name_': 'P279', 'source': 7, 'target': 5, 'label': 'subclass of'}]}