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: Pathology
Lacrimal gland function test for sjogren syndrome: 
Select and explain. 
A. Schimmer test, B. Rise Bengal test, C. Split lamp test, D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: None