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
[{'content': "Which is NOT a clinical feature of Addison's disease:March 2004 \nSelect and explain. \nA. Hypoglycemia, B. Hyponatremia, C. Hypopigmentation, D. Hyperkalemia", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. C i.e. HypopigmentationHyperpigmentation is a feature of Addison's disease, paicularly of sun-exposed areas and at pressure points, such as the neck, knees and knuckles.", 'role': 'assistant'}]