This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
Tear film is absent in 
Select and explain. 
A. Herpes keratitis, B. Keratoconjunctivitis sicca, C. Dacryoadenitis, D. Acute conjunctivitis
B: Keratoconjunctivitis sicca
Answer: B: Keratoconjunctivitis sicca 
Explanation: Keratoconjunctivitis sicca is deficiency of the aqeous layer of tear film REF:Khurana 6th edition page number 366