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': 'A 40 year old patient, a known case of cirrhosis develops acute episode of GI bleed. Initial therapy given for 6 hours. Which of the following procedure is useful - \nSelect and explain. \nA. Nasogastric aspiration, B. Urgent endoscopy, C. Sedation, D. Ultrasound', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]