This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Analysis of protein antigen is by \nSelect and explain. \nA. Southern blot, B. Nohern blot, C. Western blot, D. Eastern blot', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The western blot 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 : Ananthanarayana textbook of Microbiology 9th edition Pgno : 579', 'role': 'assistant'}]