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: Biochemistry
[{'content': "Which of the following is an example of Trinucleotide repeat mutation ? \nSelect and explain. \nA. Huntington's chorea, B. Fragile-X-syndrome, C. Friedreich ataxia, D. All of the above", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., All of the above Trinucleotide repeat mutation In this type of mutation a codon (i.e. trinucleotide sequence) undergoes amplification and the same codon is repeated continuously so many times in the chain. Diseases associated with trinucleotide repeat mutation are Huntington's disease (CAG repeat), Spinocerebellar ataxia (CAG repeat), friedreich ataxia (GAA repeat), fragile-X-syndrome (GGG or GCC repeat), dystrophia myotonica (CTG/CUG repeat), X-linked spinobulbar muscular atrophy (CAG repeat) and dentorubral pallidolusian atrophy (CAG repeat).", 'role': 'assistant'}]