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': 'Ends of chromosomes replicated by \nSelect and explain. \nA. Telomerase, B. Centromere, C. Restriction endonuclease, D. Exonuclease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Telomerase is responsible for synthesis of and maintenance of telomere length (end of chromosome).', 'role': 'assistant'}]