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
[{'content': 'A 45-year old male presented with severe respiratory distress. O/E he had pedal edema, bilateral crepitation on auscultation. He was admitted to emergency department and expired 2 days of admission. Lung biopsy done suggested the following. What is your diagnosis? \nSelect and explain. \nA. CMV pneumonitis, B. Small cell Ca lung, C. Tuberculosis, D. Heart failure cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Heart failure cellsThe lung biopsy shows intra-alveolar transudate granular pale pink material along with alveolar micro-hemorrhages & hemosiderin-laden macrophages ("heart failure" cells) seen in left-sided congestive heart failure.', 'role': 'assistant'}]