This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
All of the following are Glucocoicoid synthesis Inhibitors except? 
Select and explain. 
A. Metyrapone, B. Mifepristone, C. Etomidate, D. Ketoconazole
B: Mifepristone
Answer: B: Mifepristone 
Explanation: Mifepristone is a pharmacological antagonist at the steroid receptor. It is not a Glucocoocoid synthesis. Enzyme Inhibitor. Glucocoicoid synthesis Inhibitors & Glucocoicoids Antagonists: Glucocoocoid synthesis enzyme Inhibitors Blockade of Coisol Action Adrenal Enzyme Inhibitors Ketoconazole Metyrapone Etomidate Adrenolytic agents Mitolane (It also inhibits CYP11A1 thereby reducing steroid synthesis) Mifepristone Ref: Goodman and Gilman 13th edition Pgno: 858