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
Drug of choice for exo–erythrocytic stage of malaria is : 
Select and explain. 
A. Chloroquine, B. Primaquine, C. Proguanil, D. Mefloquine
B: Primaquine
Answer: B: Primaquine 
Explanation: None