This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
The pacemaker potential is due to 
Select and explain. 
A. Fast Na+ channel, B. Decrease in K+ permeability, C. Slow Ca++ channel, D. Rapid repolarization
B: Decrease in K+ permeability
Answer: B: Decrease in K+ permeability 
Explanation: .