This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal system, Subject name: Anatomy
Polyariticular rheumatoid ahritis is diagnosed when more than............. Joints are involved 
Select and explain. 
A. One, B. Two, C. Four, D. Five
D: Five
Answer: D: Five 
Explanation: The initial pattern of disturbution of joint involvement may be monoaicular,oligoaicular(less than 4 joints),or Polyariticular (,greater than 5 joints ) usually on a symmetric distribution Ref, :Robbins page no 1209 8th edition