This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Best radiolabelled marker for DNA replication is \nSelect and explain. \nA. Ribose, B. Thymidine, C. Phosphate, D. Uracil', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nucleic acids are readily labeled with tags that facilitate detection or purification. A variety of enzymatic or chemical methods are available to generate nucleic acids labeled with radioactive phosphates, fluorophores, or nucleotides modified with biotin or digoxygenin for example.', 'role': 'assistant'}]