Which of the following pituitary hormones works indirectly?

Step-by-step solution

Among the given hormones, TSH (Thyroid Stimulating Hormone) secreted by anterior lobe of pituitary gland, works indirectly. This hormone controls the growth and activity of thyroid gland. It influences the uptake of iodine, the synthesis of the hormones; thyroxine and tri-iodothyronine by the thyroid gland. Rest of the hormones, i.e. MSH (Melanocyte Stimulating Hormone), GH (Growth Hormone) and oxytocin work directly on their target organ. They do not stimulate any other gland.