Question: who plays sir lancelot in night at the museum
[{'answer': 'Dan Stevens', 'provenance': [{'wikipedia_id': '38890125', 'title': 'Night at the Museum: Secret of the Tomb', 'start_paragraph_id': 1, 'start_character': 284, 'end_paragraph_id': 1, 'end_character': 295, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38890125', 'title': 'Night at the Museum: Secret of the Tomb', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 98, 'bleu_score': 0.8781879837907131, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7214951341189827526}, 'section': 'Section::::Cast.\n'}]}]