This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Specific Cytogenetic Disorders, Subject name: Pathology
[{'content': 'Which of the following is not a component of triple test screening in Down syndrome? \nSelect and explain. \nA. Estriol, B. Alpha fetoprotein, C. Hcg, D. Inhibin alpha', 'role': 'user'}, {'content': "Answer: D \nExplanation: The triple test is a second trimester screening test used to identify those pregnant women who should be offered a diagnostic test to identify whether their fetus has an aneuploidy (down syndrome) The triple screen test measures serum level of AFP, Estriol and beta-HCG. High level of hCG and low level of AFP and Estriol are suggestive of positive triple test. Down's Syndrome AFP hCG ESTRIOL || || || Quad test: triple test + inhibin alpha.", 'role': 'assistant'}]