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
The anti-malarial drugs effective in preerythrocytic phase in liver are - 
Select and explain. 
A. Proguanil, B. Chloroquine, C. Pyrimethamine, D. Quinine
A: Proguanil
Answer: A: Proguanil 
Explanation: Ans. is 'a' i.e., Proguanil o The pre-erythrocytic phase in Liver is targeted for causal prophylaxis. o Drugs acting on pre-erythrocytic cycle ? Proguanil Primarily for falciparum. Primaquine ---> For all species.