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: Surgery
The most common cause of non union is 
Select and explain. 
A. Infection, B. Inadequate immobilization, C. Ischaemia, D. Soft tissue interposition
B: Inadequate immobilization
Answer: B: Inadequate immobilization 
Explanation: B i.e. Inadequate immobilization