The correct answer is option 3: Pituitary gland. The pituitary gland is responsible for producing the Growth Hormone, also known as Somatotropin.

Let`s examine the other options to better understand why they are not correct:

Option 1: Adrenal gland. The adrenal glands produce hormones such as adrenaline and cortisol, but they do not produce the Growth Hormone.

Option 2: Pancreas. The pancreas produces insulin and glucagon, which regulate blood sugar levels, but it does not produce the Growth Hormone.

Option 4: Thyroid. The thyroid gland produces hormones such as thyroxine and triiodothyronine, which regulate metabolism, but it does not produce the Growth Hormone.

It is important to note that while the stated answer is generally correct, it is possible for individual cases to exist where the Growth Hormone may be produced in another location. However, the typical and primary source of the Growth Hormone is the pituitary gland.