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': 'Michaelis - Gatmann bodies are seen in \nSelect and explain. \nA. Interstitial cystitis, B. Malackoplakia, C. Thimble Bladder, D. Transitional cell carcinoma of bladder', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Michaelis - Gutmann bodies are seen due to defective phagocytic activity, seen in Malackoplakia.', 'role': 'assistant'}]