This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joint disorders, Subject name: Orthopaedics
Joint not involved in Rheumatoid ahritis according to 1987 ACR CLASSIFICATION CRITERIA ? 
Select and explain. 
A. Knee, B. Ankle, C. Tarsometatarsal, D. Metatarsophalangeal
C: Tarsometatarsal
Answer: C: Tarsometatarsal 
Explanation: ref : maheswari 9th ed