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 the following arrangement, if  the rest is placed on a cantilever pontic , the cantilever can act as a 
Select and explain. 
A. First class lever, B. Second class lever, C. Third class lever, D. None of the above
A: First class lever
Answer: A: First class lever 
Explanation: A cantilever can be described as a rigid beam supported only at one end. When force is directed against the unsupported end of the beam (as in this rest placed on a cantilevered pontic), the cantilever can act as a first-class lever. The mechanical advantage in this illustration favors the effort arm.