This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Which of the following causes retinal pigmentation? 
Select and explain. 
A. Quinine, B. Chloroquine, C. Mefloquine, D. Atovaquone
B: Chloroquine
Answer: B: Chloroquine 
Explanation: Ans. is 'b' i.e., Chloroquine * Chloroquine is a 1st line anti malarial drug, which is an erythrocytic schizonticide.* However, its prolonged use of high doses (as in DLE, rheumatoid arthritis) may cause loss of vision due to retinal damage in the form of retinal pigmentation.* Chloroquine may also cause corneal deposits and affect vision and are reversible on discontinuation.* Loss of hearing, rashes, photoallergy, myopathy, graying of hair may occur.