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: Physiology
Deficiency of cortisol causes: 
Select and explain. 
A. Cushing syndrome, B. Graves disease, C. Addison disease, D. Acromegaly
C: Addison disease
Answer: C: Addison disease 
Explanation: Addison’s Disease:
Addison’s disease results from an inability of the adrenal cortices  to  produce  sufficient  adrenocortical  hormones.
In  Addison’s  disease,  either  glucocorticoid  or mineralocorticoid deﬁciency may come ﬁrst, but eventually all patients fail to secrete both classes of corticosteroid.