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 osteoahritis is 
Select and explain. 
A. DISTAL INTERPHALYNGEAL JOINTS, B. KNEE JOINT, C. METACARPOPHALYNGEAL JOINT, D. PROXIMAL INTERPHALYNGEAL JOINT
C: METACARPOPHALYNGEAL JOINT
Answer: C: METACARPOPHALYNGEAL JOINT 
Explanation: MCP joints are rarelyinvolved in osteoahritis ref : maheswari 9th ed