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 not causing hemolysis in G6PD deficiency? 
Select and explain. 
A. Primaquinc, B. Chloroquine, C. Nalidixic acid, D. Nitrofurantoin
B: Chloroquine
Answer: B: Chloroquine 
Explanation: Ans. is 'b' i.e., Chloroquine Among the given options, chloroquine is the best answer (though it can also cause hemolysis, but very rarely).