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
Singers Alkali denaturation test is done with : 
Select and explain. 
A. Maternal Hb, B. Fetal Hb, C. Amniotic fluid, D. Menstrual fluid
B: Fetal Hb
Answer: B: Fetal Hb 
Explanation: Ans. is b i.e. Fetal Hb Ref. Dutta Obs. 6/e, p 247-248: Williams Obs. 23/e, p 583, 584; Text book of Ohs. by Sheila Balakrishnan, p 167-168 Fetal hemoglobin can be distinguished from Adult hemoglobin by : Wright stain : On staining blood with wright stain if RBC's appear nucleateddeg the blood is of fetal origindeg. Singers alkali denaturation test : It is based on the fact that fetaldeg hemoglobin is more resistant to alkali denaturationdeg. Test -- Blood + Sodium hydroxide/ Potassium hydroxide