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 anti–arrythmic drug decreases the action potential duration in purkinje fibers ? 
Select and explain. 
A. Quinidine, B. Flecainide, C. Amiodarone, D. Lignocaine
D: Lignocaine
Answer: D: Lignocaine 
Explanation: None