What ancient civilization invented paper?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q7850', 'id': 0, 'label': 'Chinese'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q11472', 'id': 1, 'label': 'paper'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q28171280', 'id': 2, 'label': 'ancient civilization'}, {'type': 'INTERNAL', 'name_': 'Q98110535', 'id': 3, 'label': 'Qi sheng yan hai quan tu.'}, {'type': 'INTERNAL', 'name_': 'Q98767994', 'id': 4, 'label': 'Prehistoric Walled Sites and the Ancient Civilization of China'}], 'links': [{'name_': 'P407', 'source': 3, 'target': 0, 'label': 'language of work or name'}, {'name_': 'P186', 'source': 3, 'target': 1, 'label': 'made from material'}, {'name_': 'P407', 'source': 4, 'target': 0, 'label': 'language of work or name'}, {'name_': 'P921', 'source': 4, 'target': 2, 'label': 'main subject'}]}