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