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 optimum length of screw, for fixation of plate in mandible is 
Select and explain. 
A. 2mm, B. 3mm, C. 4mm, D. 6mm
C: 4mm
Answer: C: 4mm 
Explanation: None