Question: who were the stars of singing in the rain
[{'answer': 'Gene Kelly', 'provenance': [{'wikipedia_id': '1883157', 'title': "Singin' in the Rain", 'start_paragraph_id': 1, 'start_character': 98, 'end_paragraph_id': 1, 'end_character': 108, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': "Donald O'Connor", 'provenance': [{'wikipedia_id': '1883157', 'title': "Singin' in the Rain", 'start_paragraph_id': 1, 'start_character': 144, 'end_paragraph_id': 1, 'end_character': 159, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Debbie Reynolds', 'provenance': [{'wikipedia_id': '1883157', 'title': "Singin' in the Rain", 'start_paragraph_id': 1, 'start_character': 165, 'end_paragraph_id': 1, 'end_character': 180, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]