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: Microbiology
[{'content': 'The following drugs are contra-indicated for the treatment of atrial fibrillation associated with the WPW syndrome \nSelect and explain. \nA. Adenosine, B. Amiodarone, C. Verapamil, D. Flecainide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In WPW digoxin or calcium channel blockers may increase anterograde conduction through the bypass tract, so they should be avoided.', 'role': 'assistant'}]