<prompt> Ahritis involving DIP, PIP, 1st carpometacarpal with sparing of MCP and wrist joints is typical of:OsteoahritisRheumatoid ahritisAnkylosing spondylitisPsoriatic ahritis  <response>: Osteoahritis characteristically involves distal interphalangeal joint Heberdens node, proximal interphalangeal joint Bouchards node, 1st carpometacarpal joint base of thumb of hand with sparing of metacarpophalangeal joint and wrist joint. Fig. Joints involved in osteoahritis 