system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which joint is spared in Rheumatoid arthritis
assistant
The correct answer is  Ans. is 'b' i.e. DIP joints of finger. DIP joint is characteristically spared in RA.Joint most commonly involved in RA Metacarpophalangeal joints especially of index finger.