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
Histamine acts on? 
Select and explain. 
A. G protein coupled receptors, B. Ligand gated ion channels, C. Enzyme linked receptors, D. Intracellular recepters
A: G protein coupled receptors
Answer: A: G protein coupled receptors 
Explanation: Ans. is'a' i.e., G protein coupled receptorsRef: Principles of medical physiology p.7911Histamine acts on G-protein coupled membrane recePtors : -