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
Defective DNA repair is seen in all EXCEPT? 
Select and explain. 
A. Xeroderma pigmentosum, B. Werner syndrome, C. Bloom syndrome, D. Fredreich's ataxia
D: Fredreich's ataxia
Answer: D: Fredreich's ataxia 
Explanation: None