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: Unknown
Diagnostic serum markers in Down's syndrome are all except - 
Select and explain. 
A. Free oestriol, B. Alpha feto protein, C. HCG, D. Progesterone
D: Progesterone
Answer: D: Progesterone 
Explanation: Ans-D