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: Pharmacology
Adrenaline, noradrenaline and dopamine act through? 
Select and explain. 
A. Two pass receptor, B. Ligand gated channel, C. Seven pass receptor, D. One pass receptor
C: Seven pass receptor
Answer: C: Seven pass receptor 
Explanation: Ans is 'c' i.e. Seven pass receptor o Adrenergic receptors (Adrenaline, noradrenaline) and dopamine receptors are G-protein coupled receptors which are heptahelical receptors, i.e., have seven transmembrane spanning segments (Seven pass receptors)