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: Dental
[{'content': 'An advanced diagnostic technique which has been suggested as an alternative to culture methods is: \nSelect and explain. \nA. Phase contrast microscopy, B. Direct immunofluorescence, C. Latex agglutination, D. Indirect immonofluorescent microscope assays', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]