What country has produced the most Palme d'Or wins?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q179808', 'id': 0, 'label': "Palme d'Or"}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q20270982', 'id': 1, 'label': 'Palma de Oro'}], 'links': [{'name_': 'P1889', 'source': 0, 'target': 1, 'label': 'different from'}]}