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': 'Ideal bone for bone graft is \nSelect and explain. \nA. Femur, B. Fibula, C. Radius, D. Ulna', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The fibula is an ideal spare bone for a bone graft.Ref: Chaurasia; Volume 2; 6th edition; Page no: 29', 'role': 'assistant'}]