This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
Joint not involved in Rheumatoid arthritis according to 1987 modified ARA criteria? 
Select and explain. 
A. Knee, B. Ankle, C. Tarsometatarsal, D. Metatarsophalangeal
C: Tarsometatarsal
Answer: C: Tarsometatarsal 
Explanation: According to 1987 modified ARA criteria : -

Arthritis of 3 or more joint areas: soft tissue swelling (arthritis) of 3 or more joint areas observed simultaneously by a physician. The 14 possible joint areas involved are, right or left:


Proximal interphalangeal   
Metacarpophalangeal     
Metatarsophalangeal
Wrist
Knee 
Elbow
Ankle