Question: who won the last under 20 world cup
[{'answer': 'England', 'provenance': [{'wikipedia_id': '1168189', 'title': 'FIFA U-20 World Cup', 'start_paragraph_id': 3, 'start_character': 301, 'end_paragraph_id': 3, 'end_character': 308, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]