This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
When can one diagnose acute respiratory distress in a child ? 
Select and explain. 
A. Within 7 days of known clinical insult, B. Respiratory failure not fully explained, C. Left ventricular dysfunction, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Reference: GHAI Essential pediatrics, 8th edition