This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
Rarest variety of pemphigus is 
Select and explain. 
A. Pemphigus vulgaris, B. Pemphigus vegetans, C. Pemphigus foliaceus, D. Pemphigus erythematodes
C: Pemphigus foliaceus
Answer: C: Pemphigus foliaceus 
Explanation: .