This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pituitary-Hypothalmic System and Thyroid, Subject name: Pharmacology
Which of the following is synthetic form of Triiodothyronine (T3) ? 
Select and explain. 
A. Liothyronine sodium, B. Levothyroxine sodium, C. Liotrix, D. None of the above
A: Liothyronine sodium
Answer: A: Liothyronine sodium 
Explanation: THYROID AGENTS : 1. Levothyroxine (T4) - Sythetic form of thyroxine 2. Liothyronine (T3) - Sythetic form of triodothyronine 3. Liotrix - 4:1 ratio of T4: T3 Note : Liothyronine (T3) is three to four times more potent than levothyroxine, it is not recommended for routine replacement therapy because of its shoer half-life (24 hours), requiring multiple daily doses, and difficulty in monitoring its adequacy.