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: Medicine
[{'content': "Defective DNA repair is seen in all EXCEPT? \nSelect and explain. \nA. Xeroderma pigmentosum, B. Werner syndrome, C. Bloom syndrome, D. Fredreich's ataxia", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]