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': 'Glands of Zeis are: \nSelect and explain. \nA. Modified sebaceous glands, B. Modified sweat glands, C. Modified lacrimal glands, D. Modified meibomian glands', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Modified sebaceous glands', 'role': 'assistant'}]