Question: how many episodes of touching evil are there
[{'answer': '16', 'provenance': [{'wikipedia_id': '847802', 'title': 'Touching Evil', 'start_paragraph_id': 2, 'start_character': 457, 'end_paragraph_id': 2, 'end_character': 459, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '847802', 'title': 'Touching Evil', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 482, 'bleu_score': 0.618666972524966, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6726346209174406958}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '847802', 'title': 'Touching Evil', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['16', 'after 16 episodes and 3 seasons.', 'The first season consists of six 50-minute (one-hour with advertisements) episodes written by Abbott with Russell T Davies. The popularity of the serial led to two sequel serials in 1998 and 1999, although not written by Abbott or Davies. The first episode aired on 29 April 1997, and the last on 6 June 1999, after 16 episodes and 3 seasons.']}}]}]