This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': "Which is NOT a clinical feature of Addison's disease - \nSelect and explain. \nA. Hypoglycemia, B. Hyponatremia, C. Hypocalcemia, D. Hyperkalemia", 'role': 'user'}, {'content': 'Answer: C \nExplanation: there is no hypocalcemia , there is weakness and fatiguability , hyperkalemia , hyponatremia, hypotension, hypoglycemia( Harrison 17 pg 2263)', 'role': 'assistant'}]