This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
A drug that blocks the hea rate effect of a slow intravenous infusion of Phenylephrine is 
Select and explain. 
A. Atenolol, B. Prazosin, C. Atropine, D. Propranolol
C: Atropine
Answer: C: Atropine 
Explanation: .