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
Glands of Zeis are: 
Select and explain. 
A. Modified sebaceous glands, B. Modified sweat glands, C. Modified lacrimal glands, D. Modified meibomian glands
A: Modified sebaceous glands
Answer: A: Modified sebaceous glands 
Explanation: Ans. Modified sebaceous glands