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
Which is not cysticidal for entamoeba - 
Select and explain. 
A. Paramomycin, B. Chloroquine, C. Tetracycline, D. Diloxanide
B: Chloroquine
Answer: B: Chloroquine 
Explanation: Ans. is 'b' i.e., Chloroquine o Chloroquine kills trophozoites of E. histolytica (not cysts). Therefore, it is used in hepatic amoebiasis only. o All other three drugs are luminal amoebicides - Drugs directly kills trophozites responsible for production of cysts (cysticidal effect).