This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
All are true about the Sympathetic vasodilator system except 
Select and explain. 
A. It originates from the frontal coex, B. It has a strong basal tone, C. The fibres to skeletal muscles are cholinergic, D. After sympathectomy, the blood vessels dilate
B: It has a strong basal tone
Answer: B: It has a strong basal tone 
Explanation: There is no tonic activity in the vasodilator fibers(sympathetic), but the vasoconstrictor fibers to most vascular beds have some tonic activity Sympathetic noradrenergic fibers end on blood vessels in all pas of the body to mediate vasoconstriction- So sympathectomy cause vasodilation Resistance vessels in skeletal muscles are innervated by vasodilator fibers, which, although they travel with the sympathetic nerves, are cholinergic (sympathetic cholinergic vasodilator system) Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:556