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
After 28 weeks of gestation true is/are:a)  Viableb) > 1000 gm c) Lecithin/Sphingomyelin ratio >2d) Type II pneumocytes presente) Phosphatidyl glycerol present 
Select and explain. 
A. abd, B. bcd, C. abc, D. ab
A: abd
Answer: A: abd 
Explanation: None