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
Mefloquine is contraindicated with - 
Select and explain. 
A. Quinine, B. Atenolol, C. Enalapril, D. Verapamil
A: Quinine
Answer: A: Quinine 
Explanation: 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.