Question: when dna makes rna what is the base that replaces thymine
[{'answer': 'Uracil', 'provenance': [{'wikipedia_id': '1393654', 'title': 'Nitrogenous base', 'start_paragraph_id': 4, 'start_character': 1220, 'end_paragraph_id': 4, 'end_character': 1226, 'bleu_score': 1.0, 'section': 'Section::::Role in nucleic acids.\n'}]}, {'provenance': [{'wikipedia_id': '1393654', 'title': 'Nitrogenous base', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 972, 'bleu_score': 0.7524747065693961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17423468107926703665}, 'section': 'Section::::Role in nucleic acids.\n'}]}]