This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Crescents are derived from \nSelect and explain. \nA. Mesangium + fibrin + macrophage, B. Visceral epithelial cells + fibrin + macrophage, C. Parietal epithelial cells + fibrin + macrophages, D. Tubular epithelium + fibrin + macrophages', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Crescents are feature of RPGN.\nThey are made up of parietal epithelial cells,\nfibrin and monocytcs / Macrophages.', 'role': 'assistant'}]