This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Meibomian glands secrete which component of sweat? \nSelect and explain. \nA. Water (aqueous), B. Mucin, C. Protein, D. Lipid', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Lipid The major function of lacrimal apparatus is to secrete and drain the tear. Tear film consists of 3 layers :- Mucous or mucin layer (innermost):- Secreted by conjunctival goblet cells, crypts of Henle, glands of Manz. Aqueous layer (intermediate) :- This forms the bulk of the tear. It is secreted by main lacrimal and accessory lacrimal glands. Lipid layer (outermost) :- Secreted by the Meibomion Zeis, and Moll glands.", 'role': 'assistant'}]