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
CGG repeat sequence is found in: 
Select and explain. 
A. Fragile X syndrome, B. Huntingtons chorea, C. Dentatorubropallidolusyian atrophy, D. Machado Joseph disease
A: Fragile X syndrome
Answer: A: Fragile X syndrome 
Explanation: Ans: A (Fragile X syndrome) Ref: Robbins and Co! ran 'Pathologic Basis of Disease' 8th Edition.Elsevier. 2011 Page 168.Explanation:Expansions affecting non-coding regionsDiseaseProteinRepeatingSequenceFragile X syndromeFMR-1 proteinCGGFriednch ataxiaFrataxinGAAMyotonic DystophyMyotonic dystrophy protein kinase (MDPK)CTG(See the following table)