This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
[{'content': 'GE junction tumor is: \nSelect and explain. \nA. Siewe type I, B. Siewe type II, C. Siewe type III, D. Siewe type IV', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Siewe Classification Type Adenocarcinoma of Location Type I Distal esophagus 1-5 cm above cardia Type II Real Cardia 1 cm above and 2 cm below cardia Types III Sub-Cardial Stomach 2-5 cm below cardia Type III generally have a worse prognosis.', 'role': 'assistant'}]