This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Most common cardiac involvement in Rheumatoid arthritis is \nSelect and explain. \nA. Conduction defects, B. Pericarditis, C. Myocarditis, D. Infective Endocarditis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Pericarditis # CARDIAC COMPLICATIONS OF RHEUMATOID ARTHRITIS> Pericarditis: Asymptomatic. One-third of patients with seropositive RA.> Myocarditis.> Endocarditis.> Conduction defects.> Coronary vasculitis.> Granulomatous aortitis.', 'role': 'assistant'}]