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: Gynaecology & Obstetrics
Which of the following is primary neurotransmitter responsible for lowering thermoregulatory set point in triggering hot flushes 
Select and explain. 
A. Acetyl choline, B. Nor - Epinephrine, C. Dopamine, D. Glycine
B: Nor - Epinephrine
Answer: B: Nor - Epinephrine 
Explanation: Nor-Epinephrine is primary neurotransmitter known to cause hot flushes in Menopausal woman.