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: Pediatrics
[{'content': 'Which of the following are signs of neonatal respiratory distress syndrome – \nSelect and explain. \nA. Intercostal retraction, B. RR > 60/ min, C. PH < 7.2, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]