This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic procedures, Subject name: Pathology
Best site for taking biopsy for HSV esophagitis is: 
Select and explain. 
A. Edge of ulcer, B. Base of ulcer, C. Adjacent indurated area around ulcer, D. Surrounding normal mucosa
A: Edge of ulcer
Answer: A: Edge of ulcer 
Explanation: - Biopsy should be taken from: Edge of ulcer in HSV esophagitis Base of ulcer in CMV esophagitis