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': 'Confirmatory test for HIV infection is a: \nSelect and explain. \nA. ELISA, B. Immunodot, C. RIPA, D. Western Blot', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]