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: Anatomy
[{'content': 'Which joint is spared in rheumatoid ahritis \nSelect and explain. \nA. MetacarpoPhalyngeal joints of hand, B. DistalPhalyngeal JOINTS OF FINGER, C. Proximal interPhalyngeal JOINTS OF FINGER, D. ATLANTO -AXIAL JOINT', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In rheumatoid ahritis paicular impoance is the sparing of distal interpharyngeal joints. Rheumatoid ahritis (RA) is a chronic, systemic autoimmune disease that involves inflammation in the membrane lining of the joints and often affects internal organs. Most patients exhibit a chronic fluctuating course of disease that can result in progressive joint destruction, deformity, and disability. RA affects between 1 and 2 million Americans. It occurs three times more often in women, and peaks at age 35 to 50 years. JOINTS INVOLVED : Hands and wrists Shoulders Elbows Feet Knees Hips Cervical spine Refr Maheshwari 9th /e p 287', 'role': 'assistant'}]