This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'An advanced diagnostic technique which has been suggested as an alternative to culture methods is \nSelect and explain. \nA. Polymerase chain reaction, B. Direct immunofluorescence, C. Latex agglutination, D. Indirect immunofluorescent microscope assay', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]