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
Not a nucleic acid test 
Select and explain. 
A. Western blot, B. Southern blot, C. Nohern blot, D. Microarray
A: Western blot
Answer: A: Western blot 
Explanation: 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