<prompt> Commonest sign of aspiration pneumonitis is :CyanosisTachypneaCrepitationsRhonchi  <response>: Answer is B Tachyapnea: Aspiration pneumonitis is characterized by an acute onset of dyspnea, tachypnea, bronchospasm and cyanosis with a chest radiograph often showing diffuse opacities. - Harrisons Dyspnea tachypnea are ceainly the earliest manifestations to appear following aspiration of any material. The commonest and the earliest sign of aspiration pneumonitis thus would be tachypnea. 