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 radioisotope labeled molecule is used to find out rate of DNA synthesis? \nSelect and explain. \nA. Thymidine, B. Thymidine, C. Adenine, D. Adenine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Thymidine One application of isotope labeling would be in measuring DNA synthesis, that is cell proliferation in vitro. uses - thymidine labeling to compare pattern of synthesis (or sequence) in cells.", 'role': 'assistant'}]