Question: who played in the first star is born
[{'answer': 'Janet Gaynor', 'provenance': [{'wikipedia_id': '3450583', 'title': 'A Star Is Born (1976 film)', 'start_paragraph_id': 2, 'start_character': 57, 'end_paragraph_id': 2, 'end_character': 69, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Fredric March', 'provenance': [{'wikipedia_id': '3450583', 'title': 'A Star Is Born (1976 film)', 'start_paragraph_id': 2, 'start_character': 74, 'end_paragraph_id': 2, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]