This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Singer&;s Alkali denatuaion test is performed for: \nSelect and explain. \nA. Rh incompatibility, B. Vasa Pre, C. Abruptio placenta, D. Preterm labour', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Singer&;s alkali denaturation test is performed for Vasa Pre. Detection of nucleated RBCs using apt test or Singer&;s alkali denaturation test is diagnostic of vasa pre. It is based on the fact that fetal hemoglobin is resistant to alkali denaturation. Both Apt and Kleihauer-Betke Test can be used to detect the presence of fetal blood within a sample. Apt Test Kleihauer Betke Test Reagent NaOH Citric acid Phosphate buffer Assessment Qualitative Quantitative Ref: DC Dutta&;s textbook of Obstetrics 8th edition Pgno: 301', 'role': 'assistant'}]