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 mechanical advantage obtained from the wheel
and axle principle of elevator is 
Select and explain. 
A. 2.5, B. 3, C. 4.6, D. 6
C: 4.6
Answer: C: 4.6 
Explanation: None