<prompt> In which of the following condition, proximal interphalangeal joint is involved and distal interphalangeal joint is spared?OsteoarthritisPsoriatic arthritisRheumatoid arthritisAnkylosing spondylitis  <response>: Rheumatoid Arthritis Overview Systemic autoimmune inflammatory disease that primarily affects the hand and wrist. Arthritis of hand joints lasting longer than 6 weeks is one of seven diagnostic criteria used by American College of Rheumatology. In contrast to osteoarthritis, the DIP joints are usually soared in RA OARAPSORIATICJts involvedPIP, DIP 1st CMC jtPIP, MCP, WristDIP, PIP, Any jointJts sparedMCP, Wrist Ankle as primaryDIP 