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: Skin
All are false except 
Select and explain. 
A. Sweat glands are most numerous on back & least on sole, B. Palm & sole sweat glands are last to appear, C. Sweat duct produce isotonic sweat, D. Hypothalmic preoptic nucleus has key role in sweating
D: Hypothalmic preoptic nucleus has key role in sweating
Answer: D: Hypothalmic preoptic nucleus has key role in sweating 
Explanation: D i.e. Hypothalmic preoptic nucleus has key role in