This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral cavity & Oesophagus, Subject name: ENT
Ranula is a 
Select and explain. 
A. Mucous cyst, B. Tumour, C. Submandibular gland swelling, D. Swelling on dorsum of tongue
A: Mucous cyst
Answer: A: Mucous cyst 
Explanation: Ranula The term "ranula" is used to describe a diffuse swelling in the floor of the mouth caused by either a mucous extravasation or, less commonly, a mucous retention cyst derived from the major sublingual or submandibular salivary glands. It is a cystic translucent lesion seen in the floor of the mouth on one side of the frenulum and pushing the tongue tip. Treatment It is complete surgical excision if small, or marsupialization, if large. Often it is not possible to excise the ranula completely because of its thin wall or ramifications in various tissue planes. (Ref:Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 252)