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
Which  of  the  following  terms  best  describes  a  drug that blocks the action of adrenaline at its receptors by occupying those receptors without activating them? 
Select and explain. 
A. Pharmacologic antagonist, B. Non competitive antagonist, C. Physiologic antagonist, D. Chemical antagonist
A: Pharmacologic antagonist
Answer: A: Pharmacologic antagonist 
Explanation: None