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': 'Is a sweat gland: \nSelect and explain. \nA. Gland of Moll, B. Gland of Zeis, C. Mebomian gland, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Gland of Moll', 'role': 'assistant'}]