A nurse is providing teaching to a client who has a new diagnosis of hypothyroidism. On which of the following medications should the nurse prepare to instruct the client?

A. Levothyroxine: Levothyroxine is the standard treatment for hypothyroidism. It is a synthetic form of thyroid hormone used to replace the deficient thyroid hormone in the body, helping to restore normal metabolic function. B. Sumatriptan: Sumatriptan is used to treat migraines and is not relevant for the treatment of hypothyroidism. It works by constricting blood vessels in the brain but does not affect thyroid function. C. Levofloxacin: Levofloxacin is an antibiotic used to treat bacterial infections, not hypothyroidism. It does not have any role in the management of thyroid hormone levels. D. Radioactive iodine: Radioactive iodine is typically used to treat hyperthyroidism or to ablate thyroid tissue in cases of thyroid cancer, but it is not used for hypothyroidism. It can worsen hypothyroidism by further suppressing thyroid function.