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: Ans. is 'a' i.e., Atropine Dopamine, adrenaline and isopranaline act by stimulating b1 receptor in hea. As patient has b -blocker overdose, these are likely to be ineffective. o Atropine can increase hea rate in this situation by blocking parasympathetic action on hea.