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': 'In DNA, Adenine pairs with \nSelect and explain. \nA. Guanine, B. Thymine, C. Cytosine, D. Uracil', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Adenine is always paired with thymine by formation of two hydrogen bonds. Guanine is always paired with cytosine by formation of three hydrogen bonds.', 'role': 'assistant'}]