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
In rheumatoid arthritis there is inflammation of: 
Select and explain. 
A. Cartilage, B. Synovial membrane, C. Sclerosis of joints, D. Articular bone
B: Synovial membrane
Answer: B: Synovial membrane 
Explanation: None