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: Dental
The pharyngeal muscle which forms a part of buccinator mechanism is: 
Select and explain. 
A. Inferior constrictor, B. Middle constrictor, C. Superior constrictor, D. Palatopharyngeus
C: Superior constrictor
Answer: C: Superior constrictor 
Explanation: The diagram depicts the muscle involvement in buccinator mechanism: