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': "In humans, telomeres have the following sequence \nSelect and explain. \nA. 5'-GGCTTG-3', B. 5'-TTAGGG-3', C. 5'-TAACGT-3', D. 5'-GTAGGC-3'", 'role': 'user'}, {'content': "Answer: B \nExplanation: The ends of each chromosome contain structures called telomeres. Telomeres consist of sho TG-rich repeats. Human telomeres have a variable number of repeats of the sequence 5'-TTAGGG-3', which can extend for several kilobases. Ref: Biochemistry by U. Satyanarayana 3rd edition Pgno : 531", 'role': 'assistant'}]