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: Surgery
[{'content': 'All of the following joints are involved in rheumatoid ahritis, EXCEPT : \nSelect and explain. \nA. PIP, B. DIP, C. MCP, D. Cervical spine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Joint involvement is the characteristic feature of rheumatoid ahritis (RA). In general, the small joints of the hands and feet are affected in a relatively symmetric distribution. The most commonly affected joints, in order of decreasing frequency, include the metacarpophalangeal (MCP), wrist, proximal interphalangeal (PIP), knee, metatarsophalangeal (MTP), shoulder, ankle, cervical spine, hip, elbow, and temporomandibular joints. Cervical spine involvement usually affects C1-C2.', 'role': 'assistant'}]