Question: what is the role of dna polymerase in pcr
[{'answer': 'DNA replication', 'provenance': [{'wikipedia_id': '2193281', 'title': 'Taq polymerase', 'start_paragraph_id': 7, 'start_character': 442, 'end_paragraph_id': 7, 'end_character': 457, 'bleu_score': 1.0, 'section': 'Section::::In PCR.\n'}]}, {'provenance': [{'wikipedia_id': '2193281', 'title': 'Taq polymerase', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 516, 'bleu_score': 0.977397480575333, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13601013511943335231}, 'section': 'Section::::In PCR.\n'}]}]