This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Single Gene Disorders, Subject name: Pathology
[{'content': 'CGG repeat sequence is found in \nSelect and explain. \nA. Fragile X syndrome, B. Huntingtons chorea, C. Dentatorubropallidolusyian atrophy, D. Machado joseph disease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Expansions affecting non-coding regions Disease Protein Repeating Sequence Fragile X syndrome FMR-1 protein CGG Friedrich ataxia Frataxin GAA Myotonic Dystophy Myotonic dystrophy protein kinase (MDPK) CTG', 'role': 'assistant'}]