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: Dental
In self threaded pins, the pin hole is smaller than pin channel by diameter: 
Select and explain. 
A. 0.001 inch, B. 0.002 inch, C. 0.003 inch, D. 0.004 inch
D: 0.004 inch
Answer: D: 0.004 inch 
Explanation: None