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
[{'content': 'Which of the following is true regarding Rheumatoid arthritis - \nSelect and explain. \nA. Typically involves small and large joints symmetrically but spares the cervical spine, B. Causes pleural effusion with low sugar, C. Pulmonary nodules are absent, D. Enthesopathy prominent', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "The typical picture of B/L symmetrical inflammatory polyarthritis involving small joints initially and large joints later on, with sparing of the axial skeleton except the cervical spine is very likely, rheumatoid arthritis".\n\nRA causes pleural effusion with low glucose & pH.\nEnthesopathy is not seen in RA.', 'role': 'assistant'}]