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
[{'content': 'Dofetilide is which class of antiarrhythmic drug ? \nSelect and explain. \nA. Class I, B. Class II, C. Class III, D. Class IV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]