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: Surgery
A ranula is a 
Select and explain. 
A. Type of epulis, B. Sublingual thyroid, C. Thyroglossal cyst, D. Cystic swelling in the floor of the mouth
D: Cystic swelling in the floor of the mouth
Answer: D: Cystic swelling in the floor of the mouth 
Explanation: None