This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetic Disorders, Subject name: Biochemistry
[{'content': "All of the following diseases are due to excessive number of glutamine residues in proteins, EXCEPT \nSelect and explain. \nA. Huntington's chorea, B. Spinocerebellar ataxia, C. Myotonic dystrophy, D. Spinobulbar muscular atrophy", 'role': 'user'}, {'content': "Answer: C \nExplanation: CAG codes for glutamine Poly Q disorders Those diseases which are due to CAG repeat Eg : Spinobulbar muscular atrophy (Kennedy disease), Spinocerebellar ataxia Huntington's disease Myotonic dystrophy is due to | CTG repeat, not CAG.", 'role': 'assistant'}]