Question: who plays stephen in as time goes by
[{'answer': 'Paul Chapman', 'provenance': [{'wikipedia_id': '93093', 'title': 'As Time Goes By (TV series)', 'start_paragraph_id': 26, 'start_character': 606, 'end_paragraph_id': 26, 'end_character': 618, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]