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: Surgery
The most common cause of trismus is due to infection in muscle: 
Select and explain. 
A. Masseter, B. Medial pterygoid, C. Temporalis, D. All of the above
B: Medial pterygoid
Answer: B: Medial pterygoid 
Explanation: The most common cause of trismus is due to infection adjacent to muscles of jaw closure i.e., masseter, medial pterygoid, temporalis mostly due to involvement of pericoronal, submasseteric, and pterygo mandibular spaces.