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': 'Mefloquine is contraindicated with - \nSelect and explain. \nA. Quinine, B. Atenolol, C. Enalapril, D. Verapamil', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Quinine o Halofantrine or quinidine/quinine given to patients who have received mefloquine cause QTc lengthening -cardiac arrest may occur.", 'role': 'assistant'}]