Question: who is chief in one flew over the cuckoo nest
[{'answer': 'Will Sampson', 'provenance': [{'wikipedia_id': '21913863', 'title': "One Flew Over the Cuckoo's Nest (film)", 'start_paragraph_id': 1, 'start_character': 400, 'end_paragraph_id': 1, 'end_character': 412, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]