Question: who played tristan in the vicar of dibley
[{'answer': 'Peter Capaldi', 'provenance': [{'wikipedia_id': '50747113', 'title': 'The Christmas Lunch Incident', 'start_paragraph_id': 6, 'start_character': 77, 'end_paragraph_id': 6, 'end_character': 90, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]