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
Tissue schizontocide which prevents relapse of vivax malaria - 
Select and explain. 
A. Quinine, B. Primaquine, C. Pyrimethamine, D. Chloroquine
B: Primaquine
Answer: B: Primaquine 
Explanation: Ans. is 'b' i.e., Primaquine o Primaquine is the only tissue schizonticide to prevent relapse.