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
Which of the following is / are autoimmune disease: 
Select and explain. 
A. Sjogren's syndrome., B. Mikulicz's disease., C. Rheumatoid arthritis., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: Rheumatoid arthritis is reported in about 15 percent cases of Sjogren’s syndrome.