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
Drug of choice for bradycardia due to beta blocker overdose is: 
Select and explain. 
A. Atropine, B. Dopamine, C. Adrenaline, D. Isoprenaline
A: Atropine
Answer: A: Atropine 
Explanation: None