Question: who was the actor that played the cowardly lion
[{'answer': 'Bert Lahr', 'provenance': [{'wikipedia_id': '412193', 'title': 'Bert Lahr', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '412193', 'title': 'Bert Lahr', 'start_paragraph_id': 1, 'start_character': 45, 'end_paragraph_id': 1, 'end_character': 455, 'bleu_score': 0.856642515327361, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16731314264653479068}, 'section': 'Section::::Abstract.'}]}]