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': 'Which of the following indicates the function of glands of Wolfring? \nSelect and explain. \nA. Sweat gland, B. Salivary gland, C. Sebaceous gland, D. Lacrimal gland', 'role': 'user'}, {'content': "Answer: D \nExplanation: Glands of Wolfring and Krause are accessory lacrimal glands. They resemble lacrimal gland in structure and function and is located in the conjunctival stroma. Most of the glands of Wolfring lies at the superior margin of the upper tarsus, and most of the glands of Krause lies in the upper fornix. Glands of Zeiss are sebaceous glands associated with the cilia. Glands of Moll are modified sweat glands arranged in a single row numbering 20-30 in each lid. Meibomian glands or tarsal glands are modified sweat glands arranged in a single row numbering 20-30 in each lid. Ref: Riordan-Eva P. (2011). Chapter 1. Anatomy & Embryology of the Eye. In P. Riordan-Eva, E.T. Cunningham, Jr. (Eds), Vaughan & Asbury's General Ophthalmology, 18e.", 'role': 'assistant'}]