This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
"Fleischer ring" is a distinct feature of NOT RELATED-PATHOLOGY 
Select and explain. 
A. Keratoconus, B. Pterygium, C. Congenital ocular melanosis, D. Congenital epithelial Melanosis
A: Keratoconus
Answer: A: Keratoconus 
Explanation: .