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
Sweat glands are supplied by only: 
Select and explain. 
A. Parasympathetic nerves, B. Sympathetic nerves, C. Sensory nerves, D. Motor nerves
B: Sympathetic nerves
Answer: B: Sympathetic nerves 
Explanation: None