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': 'After 28 weeks of gestation true is/are:a)  Viableb) > 1000 gm c) Lecithin/Sphingomyelin ratio >2d) Type II pneumocytes presente) Phosphatidyl glycerol present \nSelect and explain. \nA. abd, B. bcd, C. abc, D. ab', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]