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: Gynaecology & Obstetrics
[{'content': 'Surfactant appears in amniotic uid at the gestational age of \nSelect and explain. \nA. 20 wks, B. 28 wks, C. 36 wks, D. 40 wks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Read below what Nelson has to say about the appearance of surfactant.\n"Surfactant is present in high concentrations in fetal lung homogenates by 20 wk gestation* but does not reach the surface of the lung until later. It appears in the amniotic uid between 28-32 wks. Mature level of pulmonary surfactant is usually present after 35 wks".\nNow I am leaving it to you to decide between 28 and 32 wks. I personally feel the answer should be 28 wks', 'role': 'assistant'}]