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
The primary cause of acantholysis in pemphigusvulgaris is 
Select and explain. 
A. auto immunity, B. intercellular oedema, C. intra epithelial oedema, D. chronic alcoholism
A: auto immunity
Answer: A: auto immunity 
Explanation: None