This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Thyroid, Subject name: Pharmacology
[{'content': "Which of the following drug doesn't act on thyroid- \nSelect and explain. \nA. Propranolol, B. Propylthiuracil, C. Sodium iodide, D. Thiocyanote", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Propranolol Thyroid inhibitorsInhibit hormone synthesis (antithyroid drugs)o Propylthiouracilo Methimazoleo CarbimazoleInhibit iodine trapping (ionic inhibitors)o Thiocyanateso Perchlorateso NitratesInhibit hormone releaseo Iodineo NaIo KIDestroy thyroid tissueo Radioactive iodineo Propranolol inhibits peripheral conversion of T4 and T3 in blood (but it does not act on thyroid gland).", 'role': 'assistant'}]