Introduction:
The posterior pituitary gland is responsible for releasing two hormones: antidiuretic hormone (ADH) and oxytocin. These hormones are synthesized in the hypothalamus and transported to the posterior pituitary, where they are stored and released into the bloodstream when needed. While all of the statements provided are generally true of posterior pituitary hormones, option A states that they include both direct and tropic hormones, which is incorrect.

Explanation:
Direct and Tropic Hormones:
- Direct hormones act directly on target organs and tissues to produce their effects. For example, ADH acts directly on the kidneys to regulate water balance in the body.
- Tropic hormones, on the other hand, act on other endocrine glands to stimulate the release of other hormones. For example, the hypothalamus releases thyrotropin-releasing hormone (TRH), which stimulates the anterior pituitary to release thyroid-stimulating hormone (TSH), which then acts on the thyroid gland to stimulate the release of thyroid hormones.

Posterior Pituitary Hormones:
- The posterior pituitary gland releases two hormones: ADH and oxytocin.
- ADH, also known as vasopressin, acts on the kidneys to regulate water balance by increasing water reabsorption. It also has vasoconstrictive effects, which can increase blood pressure.
- Oxytocin is involved in various reproductive functions, including uterine contractions during childbirth and milk letdown during breastfeeding. It also plays a role in social bonding and maternal behavior.

Stimulation of Released:
- The release of ADH and oxytocin from the posterior pituitary gland is stimulated by nerve signals from the hypothalamus.
- The hypothalamus contains specialized neurons that produce and release these hormones into the bloodstream in response to specific signals.
- For example, when the hypothalamus detects a decrease in blood volume or an increase in blood osmolarity, it sends nerve signals to the posterior pituitary to release ADH, which helps the kidneys retain water and conserve body fluids.

Conclusion:
In summary, all of the statements provided about posterior pituitary hormones are generally true, except for option A, which states that they include both direct and tropic hormones. Posterior pituitary hormones, such as ADH and oxytocin, are released from the posterior pituitary gland in response to nerve signals from the hypothalamus and play important roles in water balance, reproductive functions, and social behavior.