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: Pathology
[{'content': 'Radiographic features such as Tail sign is seen in except: \nSelect and explain. \nA. Plunging ranula, B. Mucocele, C. Both 1 and 2, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DIAGNOSIS:\xa0The tail sign is the classical and pathognomonic feature of plunging ranula in a CT. It shows small longitudinal tail-like extension of a pseudocyst. This tail sign is absent in mucocele.', 'role': 'assistant'}]