Question: who did rangers beat in the cup winners cup
[{'answer': 'Dynamo Moscow', 'provenance': [{'wikipedia_id': '2453410', 'title': "1972 European Cup Winners' Cup Final", 'start_paragraph_id': 1, 'start_character': 108, 'end_paragraph_id': 1, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]