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
Fine Needle aspiration biopsy is indicated to diagnose: 
Select and explain. 
A. Traumatic ulcer, B. Pemphigus, C. Necrotic pulp, D. Chronic gingivitis
B: Pemphigus
Answer: B: Pemphigus 
Explanation: None