This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Commonest sign of aspiration pneumonitis is : \nSelect and explain. \nA. Cyanosis, B. Tachypnea, C. Crepitations, D. Rhonchi', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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.", 'role': 'assistant'}]