Final answer:
Antidiuretic hormone (ADH) is secreted by the hypothalamus and acts on the kidneys to promote water retention by making the collecting ducts more permeable, thus reducing water loss in urine. The correct answer to the question is 'e. B and C only'.
Step-by-step explanation:
The question is about the role of antidiuretic hormone (ADH), also known as vasopressin. ADH is a hormone that is secreted by the hypothalamus and stored in the posterior pituitary gland, not the adenohypophysis. It is released into the bloodstream in response to high osmolality, such as from dehydration or stress, signaling the kidneys to conserve water. When ADH is released, it causes the collecting ducts of the kidneys to become more permeable to water, allowing more water to be reabsorbed from the filtrate (pre-urine) back into the bloodstream, reducing urine volume and preventing water loss.
Therefore, the correct answer is e. B and C only, as ADH stimulates water intake (b) and stimulates water conservation by the kidneys (c), but it is not secreted by the adenohypophysis (a).