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: Pediatrics
[{'content': 'Triplet repeats in Fragile X -syndrome is? \nSelect and explain. \nA. CTG, B. CGG, C. CAG, D. GAA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DISORDER TRIPLET REPEATS Fragile X syndrome CGG Friedreich ataxia GAA Myotonic dystrophy CTG Huntington disease CAG Ref: Nelson, 18th Edition, Pages 135, 499', 'role': 'assistant'}]