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
Singer's alkali denaturation test is used to differentiate 
Select and explain. 
A. Aboion from early pregnancy, B. Perimenopausal from pregnancy, C. Uterine malignancy from pegnancy, D. Vasa pre from placenta pre
D: Vasa pre from placenta pre
Answer: D: Vasa pre from placenta pre 
Explanation: Singer's alkali denaturation test : It is a diagnostic test for vasa pre In this nucleated red blood cells are detected Ref: Dutta Obs 9e pg 243.