This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
In the treatment of hypothyroidism, thyroxine is preferred over liothyronine because 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: (Ref: KDT 6/e p247) Liothyronine (T3) as compared to thyroxine (T4) is: Fast acting More potent Sho half life Indication of liothyronine includes myxedema coma and for most of the indications thyroxine is used because is has a long half life thus can be used less frequently than T3.