Question: name the type of enzyme used to produce the cdna
[{'answer': 'reverse transcriptase', 'provenance': [{'wikipedia_id': '7330', 'title': 'Complementary DNA', 'start_paragraph_id': 1, 'start_character': 172, 'end_paragraph_id': 1, 'end_character': 193, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7330', 'title': 'Complementary DNA', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 651, 'bleu_score': 0.928036074738358, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13024445921385540942}, 'section': 'Section::::Abstract.'}]}]