This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Disorders in neonates, Subject name: Pediatrics
[{'content': 'Surfactant appears in amniotic fluid at: \nSelect and explain. \nA. 20 wk, B. 28 wk, C. 32 wk, D. 4 wk', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Begins to appears in amniotic fluid between 28-32 weeks. Surfactant synthesis begins in fetal lungs at 20 week Mature surfactant in adequate amount- >35 weeks', 'role': 'assistant'}]