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: Unknown
Plunging ranula refers to a mucocoele that has penetrated which muscle? 
Select and explain. 
A. Sternohyoid, B. Stylohyoid, C. Omohyoid, D. Mylohyoid
D: Mylohyoid
Answer: D: Mylohyoid 
Explanation: None