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: Medicine
[{'content': 'Embolization from mitral valve vegetation is unusual to which of the following organs? \nSelect and explain. \nA. Lung, B. Brain, C. Liver, D. Spleen', 'role': 'user'}, {'content': "Answer: A \nExplanation: Mitral valve vegetations usually do not embolise to lungs. Whereas in Tricuspid valve endocarditis a 'patchy nature' of recurrent lung pneumonitis caused by embolism of vegetation in the lungs is seen. Mitral valve vegetation would not enter the lung as it would cause a 'backward flow'. Hematogenously seeded focal infection is most often clinically evident in the skin, spleen, kidneys, skeletal system, and meninges. Ref: Textbook of Medicine By Robe.l Souhami, John Moxham, Page 575 ; Harrison's Internal Medicine, 18th Edition, Page 1054-55", 'role': 'assistant'}]