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': 'Total gastrectomy is the only way of treatment for: \nSelect and explain. \nA. Proximal cancer, B. Distal cancer, C. Ulcerating cancer in the body, D. Polypoidal cancer in the antrum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Proximal cancerRef: Sabiston 20th Edition, Page 1224* Margin clearance needed proximally n cancer stomach is6cm - hence needed Total gastrectomy.(NCCN recommends 4cm margin clearance)', 'role': 'assistant'}]