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
[{'content': 'Joint involved in Rheumatoid ahritis are all except \nSelect and explain. \nA. PROXIMAL INTERPHALYNGEAL JOINT, B. DISTAL INTERPHALYNGEAL JOINTS, C. METACARPO PHALYNGEAL JOINT, D. CERVICAL C1-C2 JOINT', 'role': 'user'}, {'content': 'Answer: B \nExplanation: REF : MAHESWARI 9TH ED', 'role': 'assistant'}]