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
Stain used for maturity assessment of amniotic fluid cells : 
Select and explain. 
A. Leishman's stain, B. Sudan red, C. Nile blue sulfate, D. Congo red
C: Nile blue sulfate
Answer: C: Nile blue sulfate 
Explanation: Nile blue sulfate