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': 'DNA is detected by: \nSelect and explain. \nA. Southern blot, B. Northern blot, C. Western blot, D. Eastern blot', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Southern blot(Ref: Harrison, 18th/e, p. 521 and 17th/e, p. 390)", 'role': 'assistant'}]