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
[{'content': 'Tear film is absent in \nSelect and explain. \nA. Herpes keratitis, B. Keratoconjunctivitis sicca, C. Dacryoadenitis, D. Acute conjunctivitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Keratoconjunctivitis sicca is deficiency of the aqeous layer of tear film REF:Khurana 6th edition page number 366', 'role': 'assistant'}]