This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Anatomy
[{'content': 'All are causes of myocarditis except \nSelect and explain. \nA. Trichiasis, B. Mycobacterium tuberculosis, C. Corynebacterium diptheriae, D. SLE', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Refer robbins 9/e 571 Mycobacterium tuberculosis causes involvement of pericardium (caseous pericarditis). It is common cause of chronic constrictive pericarditis Primary pericarditis is unusual and is often viral in origin', 'role': 'assistant'}]