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': 'Nucleotide repeat in Spinocerebellar ataxia type 6. \nSelect and explain. \nA. CAG, B. CGG, C. GAA, D. CTG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fragile X - CGG\nFreidrich ataxia - GAA\nMyotonic dystrophy - CTG', 'role': 'assistant'}]