This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Evaluation and Management of Portal Hypertension, Subject name: Surgery
[{'content': 'The below instrument is used for the treatment of: \nSelect and explain. \nA. Retention of urine, B. Hemorrhoids, C. Achalasia cardia, D. Variceal bleeding', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Variceal bleeding.', 'role': 'assistant'}]