This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Neurotransmitter released in response to raised blood pressure: 
Select and explain. 
A. Acetylcholine, B. Adrenaline, C. Dopamine, D. Nor-adrenaline
A: Acetylcholine
Answer: A: Acetylcholine 
Explanation: Ans. A. AcetylcholineWhenever blood pressure rises, there is reflex stimulation of baroreceptors. These release Ach and depress the heart.