Who was the longest surviving child of King Louis XVI of France?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q7732', 'id': 0, 'label': 'Louis XVI of France'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q2833346', 'id': 1, 'label': 'Alexandre Frédéric Jacques de Masson Pezay'}], 'links': [{'name_': 'P1066', 'source': 0, 'target': 1, 'label': 'student of'}, {'name_': 'P802', 'source': 1, 'target': 0, 'label': 'student'}]}