Question: who played the caveman in night at the museum 3
[{'answer': 'Ben Stiller', 'provenance': [{'wikipedia_id': '38890125', 'title': 'Night at the Museum: Secret of the Tomb', 'start_paragraph_id': 1, 'start_character': 242, 'end_paragraph_id': 1, 'end_character': 253, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]