This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
Extensive pleural thickening and especially involving the diaphragmatic pleura are classical feature of 
Select and explain. 
A. Coal worker's pneumoconiosis, B. Asbestosis, C. Silicosis, D. Siderosis
B: Asbestosis
Answer: B: Asbestosis 
Explanation: (Asbestosis) (263-CMDT- 08) (1612-14-H17th)ASBESTOSIS - is a nodular interstitial fibrosis occuring in asbestos workers and miners is characterized by a in exorably progressive dyspnea, inspiratory crackers and in some cases clubbing and cyanosis* Radiographic features - include interstitial fibrosis, thickened pleura and calcified plaque (pleural) on the diaphragm or lateral chest wall*** HRCT is the best imaging method*** Cigarette smoking in asbestos workers increases the incidence of lung carcinoma* PFT shows - restrictive dysfunction and diffusing capacity