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 56-year old male presented with lesion at the lung apex. He was working in asbestos factory for last 20 years. The lung biopsy was seen under electron microscope which revealed the following. What is your diagnosis? \nSelect and explain. \nA. Adenocarcinoma Lung, B. Mesothelioma, C. Lung metastasis, D. Benign pleural fibroma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) MesotheliomaElectron microscopy shows long microvilli & abundant tonofilaments but absent microvillous rootlets and lamellar bodies.', 'role': 'assistant'}]