This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Nerve Fibres innervating sweat glands release the following at their endings 
Select and explain. 
A. Noradrenaline, B. Acetylcholine, C. Dopamine, D. Histamine
B: Acetylcholine
Answer: B: Acetylcholine 
Explanation: (B) Acetylcholine > Sympathetic cholinergic system serves two important function.> Sweat gland: Secretion of sweat> Vasodilation in skeletal Muscles: A part of the neurons to blood vessels in skeletal muscles are anatomically sympathetic secrete acetylcholine. Simulation of this system of neurons produces vasodilatation in skeletal muscles.