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: Pharmacology
[{'content': 'Steroids cause: \nSelect and explain. \nA. Increased TSH, B. Increased FSH, C. Prevent de-iodination, D. All of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (C) Prevent de-iodination(Ref: Katzung 11/e p670, 686)Glucocorticoids on long term use suppress the release of ACTH, GH, TSH and LH. These also inhibit the activity of 5'- deiodinase and thus inhibit the peripheral conversion of T4 to T3. These also decrease thyroid binding globulin.", 'role': 'assistant'}]