Question: when did cuba play in the world cup
[{'answer': '1938', 'provenance': [{'wikipedia_id': '40810178', 'title': 'Cuba at the FIFA World Cup', 'start_paragraph_id': 3, 'start_character': 81, 'end_paragraph_id': 3, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]