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
Which is NOT a clinical feature of Addison's disease - 
Select and explain. 
A. Hypoglycemia, B. Hyponatremia, C. Hypocalcemia, D. Hyperkalemia
C: Hypocalcemia
Answer: C: Hypocalcemia 
Explanation: there is no hypocalcemia , there is weakness and fatiguability , hyperkalemia , hyponatremia, hypotension, hypoglycemia( Harrison 17 pg 2263)