This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rheumatoid Ahritis, Subject name: Medicine
[{'content': 'The most common cardiac involvement in rheumatoid ahritis is: \nSelect and explain. \nA. Cardiomyopathy, B. Pericarditis, C. Myocarditis, D. Endocarditis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most frequent cardiac involvement in RA is pericarditis followed by cardiomyopathy Patients with RA also have heightened risk of premature atherosclerosis, and hence adherence to primary prevention guidelines is mandatory The prevalence of carotid atherosclerosis in RA is at least as high as in diabetes mellitus.', 'role': 'assistant'}]