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
DNA is detected by: 
Select and explain. 
A. Southern blot, B. Northern blot, C. Western blot, D. Eastern blot
A: Southern blot
Answer: A: Southern blot 
Explanation: Ans. is 'a' i.e., Southern blot(Ref: Harrison, 18th/e, p. 521 and 17th/e, p. 390)