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: Pathology
Hyperpigmentation is seen in all except 
Select and explain. 
A. peutz jeghers syndrome, B. addison's disease, C. cushing's sydrome, D. Aright syndrome
C: cushing's sydrome
Answer: C: cushing's sydrome 
Explanation: None