This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
[{'content': 'Trinucleotide repeat causes all except: \nSelect and explain. \nA. Hereditary motor sensory neuropathy, B. Frederich ataxia, C. Spinocerebellar ataxia, D. Huntington disease', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans: a (Hereditary motor sensory neuropathy) Ref: Ganong, 22nd ed,p. 215Some examples of trinucleotide repeat diseases:Huntington's disease -- CAGFragile X syndrome-- CGGSpinocerebellar ataxia '-- CAGMyotonic dystrophy-- CTG(Type 1,2,3,63)Frederich's ataxia-- GAA", 'role': 'assistant'}]