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
Fracture shaft femur in adults usually unites by 
Select and explain. 
A. 1 month, B. 3-4 months, C. 6-7 months, D. 1 year
B: 3-4 months
Answer: B: 3-4 months 
Explanation: None