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: Radiology
[{'content': "Extensive pleural thickening and calcification especially involving the diaphragmatic pleura are classical features of - \nSelect and explain. \nA. Coal worker's pneumoconiosis, B. Asbestosis, C. Silicosis, D. Siderosis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diaphragmatic or pericardial calcification\xa0is almost pathognomonic sign of asbestosis.', 'role': 'assistant'}]