Question: when was the last touch of frost made
[{'answer': '5 April 2010', 'provenance': [{'wikipedia_id': '651924', 'title': 'A Touch of Frost', 'start_paragraph_id': 1, 'start_character': 138, 'end_paragraph_id': 1, 'end_character': 150, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '651924', 'title': 'A Touch of Frost', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 293, 'bleu_score': 0.910036530027129, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16554716411708326014}, 'section': 'Section::::Abstract.'}]}]