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: Unknown
The following drugs are contra-indicated for the treatment of atrial fibrillation associated with the WPW syndrome: 
Select and explain. 
A. Adenosine, B. Amiodarone, C. Verapamil, D. Flecainide
C: Verapamil
Answer: C: Verapamil 
Explanation: - In WPW digoxin or calcium channel blockers may increase anterograde conduction through the bypass tract, so they should be avoided.