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
Oily layer of the tear film is formed by- 
Select and explain. 
A. Meibomian glands, B. Conjunctival goblet cells, C. Lacrimal glands, D. None
A: Meibomian glands
Answer: A: Meibomian glands 
Explanation: Ans. is 'a' i.e., Meibomian glands * The major function of lacrimal apparatus is to secrete and drain the tear. Tear film consists of 3 layersi) Mucous or mucin layer (innermost) Secreted by conjunctival goblet cells, crypts of Henle, glands of Manz.ii) Aqueous layer (intermediate) :- This forms the bulk of the tear. It is secreted by main lacrimal and accessory lacrimal glands.iii) Lipid layer (outermost) Secreted by the Meibomion, Zeis, and Moll glands.