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: Physiology
The main motor supply of intrafusal fibers is 
Select and explain. 
A. Gamma neurons, B. Alpha neurons, C. Beta neurons, D. All of the following
A: Gamma neurons
Answer: A: Gamma neurons 
Explanation: MOTOR NERVE FIBERS