This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
The following diseases have defect in DNA repair mechanism except for 
Select and explain. 
A. Xeroderma Pigmentosa, B. Fanconi syndrome, C. Huntington's disease, D. Hereditary non polyposis colon cancer
C: Huntington's disease
Answer: C: Huntington's disease 
Explanation: Robbins basic pathology 9th edition page no 840 Huntington disease is an autosomal dominant movement disorder associated with degeneration of the striatum. All other disorders have defect in DNA