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: Pharmacology
Peripheral conversion of T4 to T3 is inhibited by? 
Select and explain. 
A. Propranolol, B. Diltiazem, C. Sotalol, D. Sodium iodide
A: Propranolol
Answer: A: Propranolol 
Explanation: Ans. is 'a' i.e., Propranolol