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': 'Which of the following is most sensitive for diagnosis of HIV? \nSelect and explain. \nA. PCR, B. bDNA assay, C. NASBA, D. P24 detection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. PCR', 'role': 'assistant'}]