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: Medicine
[{'content': 'Ulcer in lesser curvature in 65-year-old male biopsy negative for malignancy not healing after 6 weeks of H2  blocker next treatment is - \nSelect and explain. \nA. Repeat biopsy, B. Total gastrectomy, C. Partial gastrectomy, D. Hydrogen blocker for another 6 weeks', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]