Which series was the first to release a game, Battlefield or Call of Duty?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q6895044', 'id': 1, 'label': 'multiplayer video game'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q192156', 'id': 2, 'label': 'Call of Duty'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q28869873', 'id': 3, 'label': 'Call of Duty: Modern Warfare Remastered'}, {'type': 'INTERNAL', 'name_': 'Q791444', 'id': 4, 'label': 'Battlefield Vietnam'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q474587', 'id': 5, 'label': 'Battlefield'}, {'type': 'INTERNAL', 'name_': 'Q811024', 'id': 6, 'label': 'Battlefield 2142'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P495', 'source': 2, 'target': 0, 'label': 'country of origin'}, {'name_': 'P404', 'source': 2, 'target': 1, 'label': 'game mode'}, {'name_': 'P527', 'source': 2, 'target': 3, 'label': 'has part(s)'}, {'name_': 'P404', 'source': 4, 'target': 1, 'label': 'game mode'}, {'name_': 'P179', 'source': 4, 'target': 5, 'label': 'part of the series'}, {'name_': 'P840', 'source': 6, 'target': 0, 'label': 'narrative location'}, {'name_': 'P404', 'source': 6, 'target': 1, 'label': 'game mode'}, {'name_': 'P179', 'source': 6, 'target': 5, 'label': 'part of the series'}]}