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
[{'content': 'Fine Needle aspiration biopsy is indicated to diagnose: \nSelect and explain. \nA. Traumatic ulcer, B. Pemphigus, C. Necrotic pulp, D. Chronic gingivitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]