This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preterm Labour, Subject name: Gynaecology & Obstetrics
[{'content': 'Nile blue sulphatase test in amniotic fluid is for \nSelect and explain. \nA. Lung maturity, B. Kidney maturity, C. Liver maturity, D. Skin maturity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nile blue sulphate test - Place on a slide, one drop of amniotic fluid and add one drop of 0.1% Nile blue sulphate. Place on slide with a cover slip and observe under high power microscope. More than 50% foetal squamous cells becoming orange in colour is considered as an indicator of foetal lung maturity. ( Please note: NBS test is NOT for Skin maturity)', 'role': 'assistant'}]