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: Pathology
Which is best for diagnosis of primary herpes simplex infection? 
Select and explain. 
A. Smear stained with Giemsa stain, B. Smear stained with Wrist's stain, C. Flurorescent staining of cytology smear, D. Routine cytology
C: Flurorescent staining of cytology smear
Answer: C: Flurorescent staining of cytology smear 
Explanation: None