<prompt> Most dangerous paicles causing pneumoconiosis are of sizeA. 1-5 micronB. 1 micronC. 5-15 micronD. 10-20 micron  <response>: 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 