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
[{'content': 'Hea failure cells are? \nSelect and explain. \nA. polymorphonuclear cells, B. Steam cells, C. Macrophages, D. Fibroblasts', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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)', 'role': 'assistant'}]