Question: when did man utd win the champions league
[{'answer': '3', 'provenance': [{'wikipedia_id': '22384594', 'title': 'Manchester United F.C. in European football', 'start_paragraph_id': 7, 'start_character': 183, 'end_paragraph_id': 7, 'end_character': 184, 'bleu_score': 1.0, 'section': 'Section::::History.:Early years.\n'}]}]