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
Plasma cells are increased in- 
Select and explain. 
A. Rheumatoid arthritis, B. Acute appendicitis, C. Bronchitis, D. Bristles of burnt skin
A: Rheumatoid arthritis
Answer: A: Rheumatoid arthritis 
Explanation: Plasma cells are increased in autoimmune diseases due to autoantigenic Stimulation.
Rheumatoid arthritis is an autoimmune disorder.