answerEntity: Caspian Sea
graph: {'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q5484', 'id': 0, 'label': 'Caspian Sea'}, {'type': 'INTERNAL', 'name_': 'Q72972391', 'id': 1, 'label': 'Terek River Basin'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q285451', 'id': 2, 'label': 'drainage system'}], 'links': [{'name_': 'P403', 'source': 1, 'target': 0, 'label': 'mouth of the watercourse'}, {'name_': 'P31', 'source': 1, 'target': 2, 'label': 'instance of'}]}