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
Hinge movement is produce by the action of: 
Select and explain. 
A. Lateral pterygoid., B. Supra hyoid muscles., C. Both., D. Temporalis.
C: Both.
Answer: C: Both. 
Explanation: Hinge movement is a purely rotational movement of the joint which takes place around a horizontal axis till the patient opens his mouth to about 20-25 mm. This movement is produced by the action of the lateral pterygoid and suprahyoid muscles and is aided by gravity. The condyle begins to glide (translate) beyond 13° rotation.