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: Pathology
Hea failure cells are? 
Select and explain. 
A. polymorphonuclear cells, B. Steam cells, C. Macrophages, D. Fibroblasts
C: Macrophages
Answer: C: Macrophages 
Explanation: Breakdown of red cells and hemoglobin leads to the appearance of hemosiderin-laden alveolar macrophages-- so-called hea failure cells--that reflect previous episodes of pulmonary edema. (Robbins Basic Pathology,9th edition,pg no.367)