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: Medicine
[{'content': "Which drug is essential in Sheehan's syndrome: \nSelect and explain. \nA. Estrogen, B. Coisone, C. Thyroxin, D. Growth hormone", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (Coisone): "Multiple hormones must be replaced in patients with pan-hypopituitarism, but coisol replacement is most impoant"(2 - Harrison 14th /1994 Sheehan\'s syndrome is post-paum infarction of the pituitary, leading to hypopituitarism. Treatment consists of hormone replacement therapy including Glucocoicoids, Thyroid hormone, Sex steroids, Growth hormone, Vasopressin, etc. Thus, multiple hormones must be replaced, but remember that Coisol replacement is most impoant.', 'role': 'assistant'}]