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
Lecithin Sphingomyelin ratio in amniotic fluid is used to assess the maturity of : 
Select and explain. 
A. Fetal liver, B. Fetal lung, C. Placenta, D. Fetal kidney
B: Fetal lung
Answer: B: Fetal lung 
Explanation: Fetal lung