This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
[{'content': 'Most common manifestation of cardiac lupus is - \nSelect and explain. \nA. Myocarditis, B. Libman-Sacks endocardits, C. Pericarditis, D. Aoic regurgitation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cardiovascular Manifestations of SLE The most common manifestation is pericarditis. Myocarditis and Libman-Sacks endocarditis can also occur. The endocarditis is due to accumulation on the hea valves of sterile fibrin containing vegetations, which is thought to be a manifestation of hypercoagulability associated with antiphospholipid antibodies. The risk of atherosclerosis is greatly increased, as is the risk of stroke and myocardial infarction. REF - DAVIDSONS MEDICINE 23E P2517', 'role': 'assistant'}]