Antidiuretic hormone is secreted by 

Concept: The antidiuretic hormone additionally known commonly as arginine vasopressin, may be a nine amino corrosive peptide discharged from the back pituitary. 

Within hypothalamic neurons, the hormone is bundled in secretory vesicles with a carrier protein called neurophysin and both are discharged upon hormone emission. The antidiuretic hormone is created through a part of the brain called the hypothalamus and it is secreted into the blood through the pituitary gland (posterior).

Therefore, Antidiuretic hormone is secreted by the Pituitary gland.

Hence, the correct answer is option B.