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
In the treatment of hypothyroidism, thyroxine is preferred over liothyronine because of thyroxine: 
Select and explain. 
A. Is faster acting, B. Has higher affinity for thyroid hormone receptors, C. Has a longer half life, D. Can be made more easily by recombinant DNA technology
C: Has a longer half life
Answer: C: Has a longer half life 
Explanation: Liothyronine (T3) as compared to thyroxine (T4) is:

Fast acting
More potent
Short half-life

An indication of liothyronine includes myxedema coma and for most of the indications, thyroxine is used because it has a long half-life thus can be used less frequently than T3.