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
In case of vertically unfavorable fracture, muscle responsible for displacement of fracture segment: 
Select and explain. 
A. Temporalis., B. Medial Pterygoid., C. Masseter., D. All of the above.
B: Medial Pterygoid.
Answer: B: Medial Pterygoid. 
Explanation: These all muscles work in case of horizontal unfavourable fracture.