Minimum duration of exposure required to develop coal miner's pneumoconiosis is:: (A) 8 years, (B) 12 years, (C) 15 years, (D) 18 years
Answer is B. Coal miner's pneumoconiosis or anthracosis is caused by exposure to coal dust. Exposure of around 12 years may be required before symptomatic disease develops. Ref: Park 21st edition page: 747.