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
An advanced diagnostic technique which has been suggested as an alternative to culture methods is: 
Select and explain. 
A. Phase contrast microscopy, B. Direct immunofluorescence, C. Latex agglutination, D. Indirect immonofluorescent microscope assays
A: Phase contrast microscopy
Answer: A: Phase contrast microscopy 
Explanation: None