Most common form of arthritis is?
A. Rheumatoid arthritis
B. Psoriatic arthritis
C. Seronegative arthritis
Correct answer : D. Osteoarthritis
Heberden’s node (on the index finger of right hand) in a case of osteoarthritis.
Osteoarthritis is the most common form of arthritis. It affects up to 80% of individuals older than 75 years.
Ref: Davidson’s Principles and Practice of Medicine, 22nd Edition, p1060
Image credits: Drahreg01 via http://en.wikipedia.org/wiki/File:Heberden-Arthrose.JPG; licensed under Creative Commons Attribution-Share Alike 3.0 Unported license.