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
Which is NOT a clinical feature of Addison's disease: March 2004 
Select and explain. 
A. Hypoglycemia, B. Hyponatremia, C. Hypopigmentation, D. Hyperkalemia
C: Hypopigmentation
Answer: C: Hypopigmentation 
Explanation: Ans. C i.e. Hypopigmentation Hyperpigmentation is a feature of Addison's disease, paicularly of sun-exposed areas and at pressure points, such as the neck, knees and knuckles.