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
Non compression osteosynthesis across fracture line can be carried out by all of the following except: 
Select and explain. 
A. Champy's plate., B. Lag screw., C. Transosseous wire., D. Kirschner's wire.
B: Lag screw.
Answer: B: Lag screw. 
Explanation: None