<prompt> Answer this question truthfullyWhich type of arthritis typically involves the proximal interphalangeal joints PIPs, distal interphalangeal joints DIPs, and the first carpometacarpal joint CMC, osteoarthritis or rheumatoid arthritis?  <response>: <reason> Osteoarthritis is the type of arthritis that classically involves the PIPs, DIPs, and the first CMC. 