Question: who sang those were the days my friends
[{'answer': 'Mary Hopkin', 'provenance': [{'wikipedia_id': '2456195', 'title': 'Those Were the Days (song)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]