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
Triple test for Down syndrome is by using all EXCEPT: September 2012 
Select and explain. 
A. Maternal HCG, B. Maternal Estriol, C. Maternal Alphafetoprotein, D. Maternal Inhibin A
D: Maternal Inhibin A
Answer: D: Maternal Inhibin A 
Explanation: Ans. D i.e. Materal HPL Inhibin A is counted in Quadruple test for Down syndrome.