Who did Keanu Reeves play in the movie The Matrix?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q4220900', 'id': 1, 'label': 'MTV Movie Award for Best On-Screen Duo'}, {'type': 'INTERNAL', 'name_': 'Q735603', 'id': 2, 'label': 'Lincoln Near-Earth Asteroid Research'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q43416', 'id': 3, 'label': 'Keanu Reeves'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q265392', 'id': 4, 'label': 'near-Earth object'}, {'type': 'INTERNAL', 'name_': 'Q207536', 'id': 5, 'label': 'The Matrix Revolutions'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q83495', 'id': 6, 'label': 'The Matrix'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P17', 'source': 1, 'target': 0, 'label': 'country'}, {'name_': 'P1346', 'source': 1, 'target': 3, 'label': 'winner'}, {'name_': 'P17', 'source': 2, 'target': 0, 'label': 'country'}, {'name_': 'P921', 'source': 2, 'target': 4, 'label': 'main subject'}, {'name_': 'P495', 'source': 5, 'target': 0, 'label': 'country of origin'}, {'name_': 'P161', 'source': 5, 'target': 3, 'label': 'cast member'}, {'name_': 'P144', 'source': 5, 'target': 6, 'label': 'based on'}]}