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The hormone responsible for regulating growth, metabolism, and body temperature is triiodothyronine, also known as T3. This hormone is produced by the thyroid gland and plays a pivotal role in managing the body’s metabolic rate, influencing how energy is used in the body. It aids in the regulation of processes such as heart rate, body temperature, and the rate at which calories are burned, which all contribute significantly to overall metabolic function.

While somatotropin (growth hormone) does play a crucial role in growth and development, particularly in childhood, it is not specifically involved in the regulation of body temperature or metabolism to the extent that triiodothyronine is. Thyroxine (T4) is another thyroid hormone that also has metabolic functions, but it primarily acts as a precursor to T3 and does not exert as immediate or potent an effect on metabolism and temperature regulation as T3 does. Thyrotropin, or thyroid-stimulating hormone (TSH), is involved in the regulation of thyroid hormone production but does not directly regulate growth or metabolism. Thus, triiodothyronine is the most accurate answer in relation to the specific functions mentioned in the question.