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: Pathology
[{'content': 'The infarct of the following organ is invariably hemorrhagic: \nSelect and explain. \nA. Kidney, B. Lung, C. Spleen, D. Heart', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pulmonary infarcts are classically wedge-shaped with base on the pleura, haemorrhagic, variable in size, and most often in the lower lobes.', 'role': 'assistant'}]