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
Triplet repeats in Fragile X -syndrome is? 
Select and explain. 
A. CTG, B. CGG, C. CAG, D. GAA
B: CGG
Answer: B: CGG 
Explanation: DISORDER TRIPLET REPEATS Fragile X syndrome CGG Friedreich ataxia GAA Myotonic dystrophy CTG Huntington disease CAG Ref: Nelson, 18th Edition, Pages 135, 499