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
Which of the following muscle is responsible for opening the jaw 
Select and explain. 
A. Medial pterygoid, B. Lateral pterygoid, C. Masseter, D. Temporalis
B: Lateral pterygoid
Answer: B: Lateral pterygoid 
Explanation: Jaw opening or depression of mandible is caused by contraction :

Digastric.
Geniohyoid.
Mylohyoid.
Lateral pterygoid.