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
Antimalarial drug used for causal prophylaxis act at which stage of developmental cycle 
Select and explain. 
A. Gametogony, B. Erythrocytic schizogony, C. Pre-erythrocytic schizogony, D. Exo-erythrocytic schizogony
C: Pre-erythrocytic schizogony
Answer: C: Pre-erythrocytic schizogony 
Explanation: Ans. C. Pre-erythrocytic schizogonyPre-erythrocytic schizogony* Occurs inside the parenchymal cells of liver.* Merozoites are liberated into blood.* Drugs acting on this stage will prevent infection of RBC and clinical attack of malaria causal prophylaxis.* Drugs are* Proguanil & Tetracycline - for falciparum.