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': 'Not a nucleic acid test \nSelect and explain. \nA. Western blot, B. Southern blot, C. Nohern blot, D. Microarray', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The western blot (sometimes called the protein immunoblot) is a widely used analytical technique used in molecular biology, immunogenetics and other molecular biology disciplines to detect specific proteins in a sample of tissue homogenate or extract Ref-Harpers illustrated biochemistry 30/e p380', 'role': 'assistant'}]