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
[{'content': 'Best site for taking biopsy for HSV esophagitis is: \nSelect and explain. \nA. Edge of ulcer, B. Base of ulcer, C. Adjacent indurated area around ulcer, D. Surrounding normal mucosa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Biopsy should be taken from: Edge of ulcer in HSV esophagitis Base of ulcer in CMV esophagitis', 'role': 'assistant'}]