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: Medicine
[{'content': "In addison's disease, most diagnostic test is: \nSelect and explain. \nA. Serum Na+, K+, rennin, B. Serum Na+, K+, saline suppression, C. Serum creatinine/urea ratio, D. ACTH stimulation test", 'role': 'user'}, {'content': "Answer: D \nExplanation: Answer is D (ACTH stimulation test): The diagnosis of Adrenal insufficiency should be made only Hith A C'TH stimulation testing - Harrison's ACTH stimulation test / Cosvntropin stimulation test Synthetic ACTH (Cosyntropin) is given parentrally in a dose of 250 tg (or 0.25 mg) Serum is obtained for coisol between 30 to 60 minutes after Cosyntropin is administered Coisol levels should be greater than 495 mmol/L (> 18pg/dL) Coisol levels >495 exclude the diagnosis of Addison's disease while coisol levels < 495 suggest a possible diagnosis of Adrenal insufficiency (primary or secondary).", 'role': 'assistant'}]