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: Surgery
[{'content': 'The operation where in the stump of the stomach is directly anastomosed to the stump of the duodenum is called - \nSelect and explain. \nA. Polya gastrectomy, B. Hoffmeister gastrectomy, C. Billroth I gastrectomy, D. Billroth II gastrectomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]