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
Virus quantification is done by 
Select and explain. 
A. Electron microscopy, B. Light microscopy, C. Plaque assay, D. Egg inoculation
C: Plaque assay
Answer: C: Plaque assay 
Explanation: Quantification assays : plaque and pock assay.