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: Orthopaedics
[{'content': 'In below elbow amputation the length of stump should be \nSelect and explain. \nA. 10 -15 cm, B. 15 - 20 cm, C. 20 - 25 cm, D. 5 - 10 cm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Level of amputation \n\nFor an amputation in a limb, ideal levels were suggested which gave the stump an optimum length to facilitate subsequent prosthetic fitting.\nFor example :\n\n\nAbove knee amputation : 25-30 cm as measured from the tip of greater trochanter.\nBelow knee amputation : 15 cm as measured from the tibial tubercle.\nAbove elbow amputation : 20 cm as measured from the tip of greater tuberosity.\nBelow elbow amputation : 18 cm as measured from the tip of olecranon.\n\nHowever, with the recent developments in the fabrication and fitting of prosthesis, it is not necessary to stick to these stump lengths. The viability of the tissue is the main criteria for determining the level of amputation.', 'role': 'assistant'}]