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
[{'content': 'Rarest variety of pemphigus among the following is \nSelect and explain. \nA. P. vulgaris, B. P. foliaceus, C. P. vegetans, D. P. erythematosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "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)', 'role': 'assistant'}]