This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Skin
Pemphigus vulgaris is caused by: 
Select and explain. 
A. Bacteris, B. Virus, C. Autoimmune, D. Fungal
C: Autoimmune
Answer: C: Autoimmune 
Explanation: Ans: (c) AutoimmuneHarrison 19th ed. / 370# PEMPHIGUS* Pemphigus is an autoimmune blistering disorder* It results from the loss of integrity of normal intercellular attachments with the epidermis.* Commonly affects indiciduals of age between 40-60.* Equal prevalence among males and females.* There are five variants of pephigus:# Pemphigus Vulgaris: most common type# Pemphigus Foliaceous: superficial pemphigus# Pemphigus Vegetans: least common type# Pemphigus Erythematous# Fogo Selvagem: an endemic form of pemphigus foliacious.* Refer to above table