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: Medicine
Acute symptomatic sinus bradycardia usually responds to - 
Select and explain. 
A. Adrenaline, B. Dopamine, C. Atropine, D. Norepinephrine
C: Atropine
Answer: C: Atropine 
Explanation: None