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
[{'content': 'Plasma cells are increased in- \nSelect and explain. \nA. Rheumatoid arthritis, B. Acute appendicitis, C. Bronchitis, D. Bristles of burnt skin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Plasma cells are increased in autoimmune diseases due to autoantigenic Stimulation.\nRheumatoid arthritis is an autoimmune disorder.', 'role': 'assistant'}]