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
Modiolus at the corner of mouth is formed by all of the following muscles except 
Select and explain. 
A. Triangularis, B. Buccinator, C. Masseter, D. Orbicularis oris
C: Masseter
Answer: C: Masseter 
Explanation: None