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
Synonym for Hailey Hailey disease is: 
Select and explain. 
A. Cicatricial pemphigoid., B. Benign mucous membrane pemphigoid., C. Familial benign pemphigus., D. Paraneoplastic pemphigus
C: Familial benign pemphigus.
Answer: C: Familial benign pemphigus. 
Explanation: None