This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
Corneal sensation is lost in- 
Select and explain. 
A. Herpes simplex, B. Conjunctivitis, C. Fungal infection, D. Trachoma
A: Herpes simplex
Answer: A: Herpes simplex 
Explanation: Corneal sensations are diminshed in herpes simplex keratitis,more specifically in Disciform keratitis caused by herpes simplex virus. Reference:Comprehensive ophthalmology,AK Khurana,6th edition,page no.109