Question: who played bill cosby's dad on cosby show
[{'answer': 'Earle Hyman', 'provenance': [{'wikipedia_id': '4266556', 'title': 'Earle Hyman', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4266556', 'title': 'Earle Hyman', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 273, 'bleu_score': 0.9569637990759251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11108564843210645413}, 'section': 'Section::::Abstract.'}]}]