This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Below knee, amputation is done at the level of 
Select and explain. 
A. 5 cm below tibial tuberosity, B. 10 cm below tibial tuberosity, C. 15 cm below tibial tuberosity, D. 20 cm below tibial tuberosity
B: 10 cm below tibial tuberosity
Answer: B: 10 cm below tibial tuberosity 
Explanation: In below knee amputation, approximately 10 cm below the tibial tuberosity, an anterior incision of two-thirds of the circumference is created.Posterior flap is taken longerRef: Bailey and love pg: 958