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
For maturity estimation, amniotic fluid cells are stained with : 
Select and explain. 
A. Nile blue sulphate, B. Methylene blue, C. Mucicarmine, D. Sudan black
A: Nile blue sulphate
Answer: A: Nile blue sulphate 
Explanation: Nile blue sulphate