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
The action of digastric muscle is: 
Select and explain. 
A. Depression of mandible, B. Protrusion of mandible, C. Side-to-side movement of mandible, D. Depressing the floor of the mouth
A: Depression of mandible
Answer: A: Depression of mandible 
Explanation: None