Question: who played caleb in sarah plain and tall
[{'answer': 'Christopher Bell', 'provenance': [{'wikipedia_id': '8913027', 'title': 'Sarah, Plain and Tall (film)', 'start_paragraph_id': 8, 'start_character': 12, 'end_paragraph_id': 8, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]