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 among the following is 
Select and explain. 
A. P. vulgaris, B. P. foliaceus, C. P. vegetans, D. P. erythematosis
C: P. vegetans
Answer: C: P. vegetans 
Explanation: "Pemphigus vulgaris is most common among all pemphigus patients followed by pemphigus foliaceus, pemphigus erythrematosis and then pemphigus vegetans"(Ref: IADVL textbook volume 1 pg 937)