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: Pathology
[{'content': "The following diseases have defect in DNA repair mechanism, except for: \nSelect and explain. \nA. Xeroderma Pigmentosa, B. Fanconi syndrome, C. Huntington's disease, D. Hereditary non polyposis colon cancer", 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Huntington&;s disease', 'role': 'assistant'}]