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. Increase TSH, B. Increased FSH, C. Prevent de-iodination, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Refer Katzung 11/e p 670 Glucocoicoids on long term use suppress the realese of ACTH, GH, TSH, 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'}]