Trinucleotide repeats found ina) Huntigton's diseaseb) Spinocerebellar ataxiac) Amyotropic lateral sclerosisd) Sclerosis: (A) ac, (B) a, (C) ad, (D) ab
Answer is D. Examples of trinucleotide repeat mutation :-


Huntignton's disease      
Spinocerebella ataxia 
Friedreich ataxia      
Fragile - X-syndrome
Dystrophia myotanica
Dentorubral pallidoluysiane atrophy
X-chromosome spinobulbar muscular atrophy