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
Triiodothyronine (T3) as compared to T4 : 
Select and explain. 
A. Is more plasma protein bound, B. Is shorter acting, C. Is less potent, D. Has delayed action
B: Is shorter acting
Answer: B: Is shorter acting 
Explanation: T3 is the main active thyroid hormone. It is more potent (less plasma protein bound) and faster acting than T4. How­ever, short duration of action limits its use for the treatment of hypothyroidism (requires lifelong treatment).
T3 is indicated for the treatment of myxedema coma.