This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetic and genetic disorders, Subject name: Pediatrics
All the following diseases are associated with triplet and other repeat sequences except 
Select and explain. 
A. Huntington's disease, B. Friedreich's ataxia, C. Myotonic dystrophy, D. Hereditary motor-sensory neuropathy
D: Hereditary motor-sensory neuropathy
Answer: D: Hereditary motor-sensory neuropathy 
Explanation: Disease Nucleotide Repeat Gene affected Chromosome Fragile X syndrome CGG FMR1 Sex X chromosome Friedrich ataxia GAA FXN 9 Huntington&;s disease CAG HTT 4 Myotonic dystrophy - type 1 CTG DMPK 19 Reference: GHAI Essential pediatrics, 8th edition