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: Medicine
[{'content': 'In rheumatoid ahritis pathology stas in \nSelect and explain. \nA. Aicular cailage, B. Capsule, C. Synovium, D. Muscle', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. SynoviumRA is a chronic multisystem disorder that may affect many tissues and organs, but principally attacks the joint, producing a nonsuppurative proliferative and inflammatory synovitis that often progresses to destruction of the aicular cailage and ankylosis ofthe joint.', 'role': 'assistant'}]