Most dangerous paicles causing pneumoconiosis are of size: (A) A. 1-5 micron, (B) B. <1 micron, (C) C. 5-15 micron, (D) D. 10-20 micron
Answer is A. In pneumoconiosis, the most dangerous paicles range from 1-5 micron in diameter, because they may reach the terminal small airway and settle in there lining notes The solubility and cytotoxicity of paicles ,modify the nature of pulmonary response