Question: who plays charles on when calls the heart
[{'answer': 'Marcus Rosner', 'provenance': [{'wikipedia_id': '41630866', 'title': 'When Calls the Heart', 'start_paragraph_id': 30, 'start_character': 12, 'end_paragraph_id': 30, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Cast.:Recurring.\n'}]}]