This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Medicine
In comparison to a normal healthy person, in the evening time, which of these will have an elevated ACTH as well as elevated Coisol? 
Select and explain. 
A. Normal healthy person in the morning, B. Addison's disease, C. Cushing's disease, D. After exercise
C: Cushing's disease
Answer: C: Cushing's disease 
Explanation: Normally, coisol production drops just after we fall asleep. In Cushing's syndrome, coisol levels don't drop. (Loss of diurnal variation)