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
Trismus is due to inflammation of: 
Select and explain. 
A. Medial pterygoid, B. Facial nerve irritation, C. Superior constrictor, D. Buccinator
A: Medial pterygoid
Answer: A: Medial pterygoid 
Explanation: None