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
The infarct of the following organ is invariably hemorrhagic: 
Select and explain. 
A. Kidney, B. Lung, C. Spleen, D. Heart
B: Lung
Answer: B: Lung 
Explanation: Pulmonary infarcts are classically wedge-shaped with base on the pleura, haemorrhagic, variable in size, and most often in the lower lobes.