This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Which is not found in DNA: \nSelect and explain. \nA. Adenine, B. Thymine, C. Guanine, D. Uracil', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Uracil', 'role': 'assistant'}]