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': 'hn RNA seen in \nSelect and explain. \nA. Spinal muscular dystrophy, B. Sickle cell disease, C. Hutchinson chorea, D. α-Thallasemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: β-thalassemia & spinal muscular atrophy occur due to defective splicing of hnRNA.', 'role': 'assistant'}]