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': 'Which of the agents is used as medical treatment for variceal bleed? \nSelect and explain. \nA. Octreotide, B. Desmopressin, C. Vasopressin, D. Nitroglycerine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Somatostatin and the synthetic longer lasting analogue OCTREOTIDE are now the first choice for the pharmacological control of acutely bleeding varices. Ref: CMDT 2008 Edition, Page 559-560', 'role': 'assistant'}]