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
Corneal diameter is increased in: 
Select and explain. 
A. Megalocornea, B. Keratoglobus, C. Keratoconus, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. All of the above