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': 'Catgut is prepared from submucosal layer of theintestine of - \nSelect and explain. \nA. Cat, B. Sheep, C. Human being, D. Rabbit', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Sheep", 'role': 'assistant'}]