Question: who plays brigham young on hell on wheels
[{'answer': 'Gregg Henry', 'provenance': [{'wikipedia_id': '44413648', 'title': 'Hell on Wheels (season 5)', 'start_paragraph_id': 26, 'start_character': 12, 'end_paragraph_id': 26, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Cast.:Recurring cast.\n'}]}]