**Core Concept**
Acidophils are a type of cell found in the anterior pituitary gland, responsible for secreting specific hormones that play a crucial role in various physiological processes, including growth and development.

**Why the Correct Answer is Right**
The correct answer is a hormone secreted by acidophils, which is crucial for stimulating the growth and development of various tissues, including the mammary glands, in preparation for lactation. This hormone acts through a specific receptor, stimulating a downstream signaling pathway that regulates gene expression. The hormone also plays a role in stimulating the production of other hormones, such as insulin-like growth factor-1 (IGF-1).

**Why Each Wrong Option is Incorrect**
**Option A:** Growth hormone is not secreted by basophils, another type of cell found in the anterior pituitary gland, which secretes hormones such as follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
**Option B:** Adrenocorticotropic hormone (ACTH) is secreted by basophils, which stimulates the adrenal glands to produce cortisol.
**Option C:** Thyroid-stimulating hormone (TSH) is secreted by thyrotrophs, a type of basophil found in the anterior pituitary gland, which regulates thyroid function.
**Option D:** Prolactin is secreted by lactotrophs, a type of basophil found in the anterior pituitary gland, which stimulates milk production in lactating women.

**Clinical Pearl / High-Yield Fact**
Growth hormone deficiency in children can lead to growth retardation and short stature, while excess growth hormone production can cause acromegaly, a condition characterized by excessive growth of body tissues.

**Correct Answer: C. Thyroid-stimulating hormone (TSH) is secreted by thyrotrophs, a type of basophil found in the anterior pituitary gland, which regulates thyroid function.