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
Pigment deposition on cornea seen in: 
Select and explain. 
A. Chloroquine, B. Digoxin, C. Ranitidine, D. All
A: Chloroquine
Answer: A: Chloroquine 
Explanation: Ans. Chloroquine