**Core Concept**
The pituitary stalk connects the hypothalamus to the pituitary gland, playing a crucial role in regulating hormone secretion. The **hypothalamic-pituitary axis** is essential for controlling various bodily functions. Resection of the pituitary stalk disrupts this axis, affecting hormone production.

**Why the Correct Answer is Right**
After pituitary stalk resection, most hormones are affected due to the disruption of the hypothalamic-pituitary axis. However, **prolactin** secretion is inhibited by dopamine from the hypothalamus. When the pituitary stalk is resected, this inhibitory effect is removed, leading to an increase in prolactin levels.

**Why Each Wrong Option is Incorrect**
**Option A:**
**Option B:**
**Option C:**
Since the actual options are not provided, a general explanation is given: typically, options that are incorrect would involve hormones whose secretion is significantly reduced or altered due to the loss of stimulatory or inhibitory signals from the hypothalamus.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that prolactin is unique among pituitary hormones because its secretion is primarily regulated by inhibitory factors from the hypothalamus, notably dopamine. This distinguishes it from other pituitary hormones, which are mostly regulated by stimulatory factors.

**Correct Answer:** D. Prolactin