This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
Heart failure cells are seen in? 
Select and explain. 
A. Pulmonary infarction, B. Pulmonary edema, C. Pneumonia, D. Pulmonary embolism
B: Pulmonary edema
Answer: B: Pulmonary edema 
Explanation: Ans. is 'b' i.e., Pulmonary edema * Heart failure cells are Hemosiderin laden alveolar macrophages.* Heart failure cells are a manifestation of pulmonary congestion and edema (as seen in heart failure).* Pulmonary edema & pulmonary infarction can be differentiated by the presence of heart failure cells in pulmonary edema.