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
Which of the following best represents `ranula'? 
Select and explain. 
A. A type of epulis, B. A thyroglossal cyst, C. Cystic swelling in the floor of mouth, D. A type of mucus retention cyst
C: Cystic swelling in the floor of mouth
Answer: C: Cystic swelling in the floor of mouth 
Explanation: None