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
Best site for taking biopsy for viral oesophagitis 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: In viral esophagitis dit Herpes simplex the biopsy sample is taken from the edge of the ulcer.