This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'What is true of pepsinogen? \nSelect and explain. \nA. Is a condition in which it is safe to leave microscopic disease at the cut edges, B. Shows favorable response to radiotherapy, C. Has a 5-year survival rate of about 12%, D. Rates are increased in patients with duodenal ulcer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Survival rates are increased in patients with gastric ulcer. The 5-year survival rate for all types of gastric carcinoma is about 12%, but it is 35% if the nodes are clear and 7% if the nodes are involved. It is important that the cut edges are clear of tumor to avoid almost certain recurrence.', 'role': 'assistant'}]