This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Motor System, Subject name: Physiology
The efferent limb of a myotatic reflex includes a(n): 
Select and explain. 
A. Anterior horn motor neuron, B. Lateral horn visceromotor nucleus., C. Muscle spindle., D. Preganglionic sympathetic neuron
A: Anterior horn motor neuron
Answer: A: Anterior horn motor neuron 
Explanation: The myotatic reflex is a monosynaptic, sretch reflex. The efferent limb consists of the axon of an anterior horn alpha motor neuron that innervates striated muscle fibers (effector). The afferent limb consists of a muscle spindle (receptor) and an Ia fiber (axon) of a spinal ganglion neuron.