This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nucleotides, Subject name: Biochemistry
[{'content': "Deamination of 'methylated cytosine' will produce: \nSelect and explain. \nA. Thymine, B. Adenine, C. Xanthine, D. Guanine", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Spontaneous deamination of Cytosine produces Uracil. Thymine is 5-Methyl Uracil. So, deamination of methylated Cytosine will produce Thymine.', 'role': 'assistant'}]