This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
Which drug is essential in Sheehan's syndrome 
Select and explain. 
A. Estrogen, B. Coisone, C. Thyroxine, D. Growth hormone
B: Coisone
Answer: B: Coisone 
Explanation: Sheehan syndrome is a condition that happens when the pituitary gland is damaged during childbih. It's caused by excess blood loss (hemorrhage) or extremely low blood pressure during or after labor. A lack of blood deprives the pituitary of the oxygen it needs to work properly Lifelong hormone replacement therapy for the hormones that are missing. This may involve treatment with glucocoicoids. After hormone profiling, treatment with coisol, ACTH, thyroid hormones, gonadotropins, and prolactin as seen in cases of hypopituitarism may occur.[ Ref Harrison20th edition pg 2456