This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other Respiratory Disorders, Subject name: Pediatrics
[{'content': 'When can one diagnose acute respiratory distress in a child? \nSelect and explain. \nA. Within 7 days of known insult, B. Respiratory failure not fully explained by cardiac failure, C. No left ventricular dysfunction, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Diagnostic criteria of ARDS in children: BERLIN DEFINITION CRITERIA Timing Within 1 wk of a known clinical insult or new or worsening respiratory symptoms Chest X-rays or tomography scan Bilateral opacities not fully explained by effusions, lobar/lung collapse, or nodules Origin of edema Respiratory failure not fully explained by cardiac failure or fluid overload Oxygenation Mild: PaO2/FiO2 - 200-300 mm Hg Moderate: PaO2/FiO2 - 100-200 mm Hg Severe: PaO2/FiO2 <100 mm Hg', 'role': 'assistant'}]