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': 'In flap method of amputation, which structure is kept shoer than the level of amputation? \nSelect and explain. \nA. Bone, B. Muscles, C. Nerves, D. Vessels', 'role': 'user'}, {'content': "Answer: A \nExplanation: Bone is kept shoer than soft tissue in flap method of amputation to facilitate closure of amputation stump. Also know: In guillotine amputation, limb is transected at one level through skin, muscle and bone. Ref: Campbell's operative Ohopaedics 10/e, page 544.", 'role': 'assistant'}]