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
Is a sweat gland: 
Select and explain. 
A. Gland of Moll, B. Gland of Zeis, C. Mebomian gland, D. All of the above
A: Gland of Moll
Answer: A: Gland of Moll 
Explanation: Ans. Gland of Moll