Question: who opened for the rolling stones in 1981
[{'answer': 'George Thorogood', 'provenance': [{'wikipedia_id': '8545280', 'title': 'The Rolling Stones American Tour 1981', 'start_paragraph_id': 7, 'start_character': 432, 'end_paragraph_id': 7, 'end_character': 448, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'The J Geils Band', 'provenance': [{'wikipedia_id': '8545280', 'title': 'The Rolling Stones American Tour 1981', 'start_paragraph_id': 7, 'start_character': 454, 'end_paragraph_id': 7, 'end_character': 470, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Prince', 'provenance': [{'wikipedia_id': '8545280', 'title': 'The Rolling Stones American Tour 1981', 'start_paragraph_id': 7, 'start_character': 532, 'end_paragraph_id': 7, 'end_character': 538, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '8545280', 'title': 'The Rolling Stones American Tour 1981', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 594, 'bleu_score': 0.568248329574767, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2799314932020915044}, 'section': 'Section::::History.\n'}]}]