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
Trismus is  not seen: 
Select and explain. 
A. Scleroderma., B. OSMF., C. Pemphigus., D. None.
C: Pemphigus.
Answer: C: Pemphigus. 
Explanation: Scleroderma: 
Difficulty in mouth opening due to involvement of perioral skin.