This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Most sensitive test for HIV 
Select and explain. 
A. ELISA, B. western blot, C. Lymph node biopsy, D. Southern blot
A: ELISA
Answer: A: ELISA 
Explanation: Most sensitive test for HIV is ELISA.