This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of pituitary gland, Subject name: Medicine
[{'content': 'L- arginine test is used for testing reserve of? \nSelect and explain. \nA. Prolactin, B. Cosyntropin test, C. Metyrapone test, D. Growth hormone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tests used for testing reserves of hormones GH Insulin tolerance test GHRH test L-arginine test L-dopa test Prolactin TRH stimulation test Cosyntropin test ACTH effect on plasma coisol Metyrapone test ACTH effect on plasma coisol', 'role': 'assistant'}]