This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2017, Subject name: Anatomy
Which of the following marked muscles is Involved in Opening of jaw? 
Select and explain. 
A. A, B. B, C. C, D. D
A: A
Answer: A: A 
Explanation: Depression of Mandible done by Lateral Pterygoid Mylohyoid Anterior belly of digastric muscle *In the image Marker A - Lateral Pterygoid Marker B - Lateral to mandible bone - Masseter Marker C - TowardsTemporal region - Temporalis (retraction of Mandible) Marker D - Subcutaneous Muscle - Buccinator (Cheek muscle - Accessory Muscle for mastication) *Angle of mandible has Masseter laterally Medial pterygoid medially *ELEVATORS- Mnemonic - MTMe M - Masseter T - Temporalis M - Medial Pterygoid