What is the target organ of thyrotropin-releasing hormone (trh) ? select from letters a-d?

Thyroid stimulating hormone is produced and released into the blood stream by the pituitary gland. It controls production of the thyroid hormone, thyroxine, T4 and Triiodothyronine, T3 by the thyroid gland by binding to receptors located on the cells in the thyroid gland. T4 and T3 stimulates the metabolism of almost all tissues in the body. Therefore, in this case the target cell is C