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
[{'content': 'Most sensitive test for HIV infection \nSelect and explain. \nA. Western blot, B. ELISA, C. Agglutination test, D. CFT', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., ELISA", 'role': 'assistant'}]