This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: Surgery
[{'content': 'The clinical diagnosis of the patient is? \nSelect and explain. \nA. Ranula, B. Cystic Hygroma, C. Erythroplakia, D. Epulis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) RanulaRanula is a pseudocyst that is associated with mucus extravasation into the surrounding soft tissues. These lesions occur as the result of trauma or obstruction to the salivary gland excretory duct and spillage of mucin into the surrounding soft tissues.', 'role': 'assistant'}]