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
Extensive pleural thickening and calcification especially involving the diaphragmatic pleura are classical features of - 
Select and explain. 
A. Coal worker's pneumoconiosis, B. Asbestosis, C. Silicosis, D. Siderosis
B: Asbestosis
Answer: B: Asbestosis 
Explanation: Diaphragmatic or pericardial calcification is almost pathognomonic sign of asbestosis.