This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lacrimal Gland, Subject name: Ophthalmology
[{'content': 'Absence of tear film is seen in \nSelect and explain. \nA. Conjunctivitis, B. Lacrimal gland removal, C. Herpes keratitis, D. Kerato conjunctivitis sicca', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e. Keratoconjunctivitis sicca. Keratoconjunctivitis sicca: A condition in which there is deficiency of the aqueous tears.Causes are:Sjogren\'s syndromeCongenital alacrimaParalytic hyposecretionIdiopathic hyposecretionAbsence of tear film is not seen in lacrimal gland removal because :"It must be remembered that xerosis or dryness of the conjunctiva does not result from extirpation of the superior and inferior lacrimal glands, the moistening of the conjunctiva by Krause\'s glands and its own mucous cells being sufficient to prevent it."', 'role': 'assistant'}]