Question: who starred in the film the jazz singer
[{'answer': 'Al Jolson', 'provenance': [{'wikipedia_id': '68145', 'title': 'The Jazz Singer', 'start_paragraph_id': 1, 'start_character': 459, 'end_paragraph_id': 1, 'end_character': 468, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'May McAvoy', 'provenance': [{'wikipedia_id': '68145', 'title': 'The Jazz Singer', 'start_paragraph_id': 20, 'start_character': 12, 'end_paragraph_id': 20, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Warner Oland', 'provenance': [{'wikipedia_id': '68145', 'title': 'The Jazz Singer', 'start_paragraph_id': 18, 'start_character': 12, 'end_paragraph_id': 18, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Yossele Rosenblatt', 'provenance': [{'wikipedia_id': '68145', 'title': 'The Jazz Singer', 'start_paragraph_id': 44, 'start_character': 574, 'end_paragraph_id': 44, 'end_character': 592, 'bleu_score': 1.0, 'section': 'Section::::Production.:Introduction of sound.\n'}]}]