Which of the following hormones is not produced by the anterior pituitary?

• A. Adrenocorticotropic Hormone (ACTH)
• B. Prolactin
• C. Growth Hormone (GH)
• D. Follicle-Stimulating Hormone (FSH)
• E. Melatonin
• F. Thyroid-Stimulating Hormone (TSH)

Answer: (E)

Verified step by step guidance

1. Step 1: Understand the role of the anterior pituitary gland, which produces several key hormones that regulate various physiological functions.
2. Step 2: Identify the hormones listed in the problem and determine which are known to be secreted by the anterior pituitary. These include Adrenocorticotropic Hormone (ACTH), Growth Hormone (GH), Prolactin, Follicle-Stimulating Hormone (FSH), and Thyroid-Stimulating Hormone (TSH).
3. Step 3: Recognize that Melatonin is not produced by the anterior pituitary. Instead, it is secreted by the pineal gland and is involved in regulating circadian rhythms and sleep-wake cycles.
4. Step 4: Compare the functions and sources of each hormone to confirm that Melatonin is the only hormone in the list not produced by the anterior pituitary.
5. Step 5: Conclude that Melatonin is the correct answer because it is produced by the pineal gland, distinguishing it from the other hormones listed.