This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
A 68-year-old female with congestive hea failure and progressive breathing problems Histologic sections of lung tissue is given below. These "hea failure cells" originate from alveolar? 
Select and explain. 
A. Eosinophils, B. Endothelial cells, C. Macrophages, D. Lymphocytes
C: Macrophages
Answer: C: Macrophages 
Explanation: The following HPE reveal numerous hemosiderin-laden cells within the alveoli. In the lung, alveolar macrophages can phagocytize the red blood cells that accumulate in alveoli in individuals with congestive hea failure. These cells contain hemosiderin and are referred to as "hea failure cells." Reference: Robbins & Cotran Pathologic Basis of Disease, 9edition.