This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, 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: Polyglutamine Disorders Huntington Disease (HD) Spinobulbar Muscular Atrophy (SBMA) Spinocerebellar Ataxias (SCA types 1, 2, 3, 6, 7, and 17) Dentatorubro-Pallidoluysian Atrophy (DRPLA) Non-polyglutamine Disorders Fragile X Syndrome (FRAXA) Fragile XE Mental Retardation (FRAXE) Friedreich Ataxia (FRDA) Myotonic Dystrophy (DM, not MD) Spinocerebellar Ataxias (SCA types 8, and 12) Ref-D.M.Vasudevan 7/e p509', 'role': 'assistant'}]