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
Which of the following antidotes is used for calcium channel blockers overdose ? 
Select and explain. 
A. Atropine, B. Calcium gluconate, C. Adrenaline, D. Digoxin
B: Calcium gluconate
Answer: B: Calcium gluconate 
Explanation: None