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: Social & Preventive Medicine
An Englishman travels to a place which isresistant to chloroquine and mefloquine. What should he take as prophylaxis ? 
Select and explain. 
A. Primaquine, B. Hydrchlorquine, C. Proguanil, D. Aesunate
C: Proguanil
Answer: C: Proguanil 
Explanation: Ans. is 'c' i.e., Proguanil