This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of Cornea, Subject name: Ophthalmology
A patient came to eye OPD with disc shaped edema over cornea and has a history of vesicles over lips few weeks back. There is no ulcer on staining. What can be the diagnosis: 
Select and explain. 
A. Disciform viral keratitis, B. Marginal ulcer, C. Metherpetiform keratitis, D. None of the above
A: Disciform viral keratitis
Answer: A: Disciform viral keratitis 
Explanation: The clinical features are suggestive of disciform keratitis seen in herpetic eye infections DISCIFORM KERATITIS Hypersensitivity reaction to HSV antigen Endothelitis f/b stromal edema Focal disc shaped edema with no ulcer KP may be present Wessley ring may be present Diminished corneal sensation Mild uveitis and rise of iop Antiviral + steroid