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
Facilitation of flexor muscle tone is by 
Select and explain. 
A. Vestibulospinal tract, B. Tectospinal tract, C. Rubrospinal tract, D. Reticulospinal tract
C: Rubrospinal tract
Answer: C: Rubrospinal tract 
Explanation: Rubrospinal tract facilitates flexor muscle and inhibits extensor muscles.
Vestibulospinal tract facilitates extensor muscle of lower limb and inhibits flexors.