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: Anatomy
Voluntary retrusion of mandible in closed mouth is done by which muscles? 
Select and explain. 
A. Anterior belly of digastric, B. Posterior fibers of temporalis, C. Posterior belly of digastric, D. Deep fibers of masseter
B: Posterior fibers of temporalis
Answer: B: Posterior fibers of temporalis 
Explanation: None