This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
[{'content': 'Common site of fracture in tibia is \nSelect and explain. \nA. Upper one-third, B. Junction of upper two-thirds and lower one-third, C. Lower one-third, D. Middle one-third', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The tibia is commonly fractured at the junction of upper two-thirds and lower one-third of the shaft as the shaft is most slender here. Such fractures may unite slowly, or may not unite at all as the blood supply to this pa of the bone is poor. This may also be caused by tearing of the nutrient aery.Ref: Chaurasia; Volume 2; 6th edition; Page no: 25', 'role': 'assistant'}]