Question: who plays the black knight in monty python
[{'answer': 'John Cleese', 'provenance': [{'wikipedia_id': '180196', 'title': 'Black Knight (Monty Python)', 'start_paragraph_id': 3, 'start_character': 214, 'end_paragraph_id': 3, 'end_character': 225, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}, {'provenance': [{'wikipedia_id': '180196', 'title': 'Black Knight (Monty Python)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 549, 'bleu_score': 0.9550237800704321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18370225768744239848}, 'section': 'Section::::Overview.\n'}]}]