This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Which of the following is antidote for beta-blocker poisoning? 
Select and explain. 
A. Calcium gluconate, B. Glucagon, C. Sodium phosphate, D. Chloride salts
B: Glucagon
Answer: B: Glucagon 
Explanation: Calcium gluconate is antidote for potassium and for MGSO4 Glucagon is used for beta-blocker poisoning which neutralizes bradycardia, hypotension by stimulating cyclic AMP. Ref : KAtzung 12th ed.