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
Catgut is prepared from submucosal layer of theintestine of - 
Select and explain. 
A. Cat, B. Sheep, C. Human being, D. Rabbit
B: Sheep
Answer: B: Sheep 
Explanation: Ans. is 'b' i.e., Sheep