Which Hormone contain iodine?

A. Thyroxine 
B. Insulin
C. Adrenaline.
D. None of these

Explanation:

Internally, the gland consists of follicles, which produce thyroxine and triiodothyronine hormones. These hormones contain iodine. About 95 percent of the active thyroid hormone is thyroxine, and most of the remaining 5 percent is triiodothyronine. Both of these require iodine for their synthesis.