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: Ophthalmology
Which drug causes bull's eye macula: 
Select and explain. 
A. Phenytoin, B. Chloroquine, C. Steroids, D. Ethambutal
B: Chloroquine
Answer: B: Chloroquine 
Explanation: Ans. Chloroquine