Which of the following is NOT considered an Eicosanoid?

Eicosanoids are a diverse group of bioactive lipids derived from arachidonic acid (a 20-carbon fatty acid) and play critical roles in various physiological processes, including inflammation, immunity, and vascular function. The key classes of eicosanoids include prostaglandins, leukotrienes, and thromboxanes.

Prostaglandins are a well-known type of eicosanoid that have various functions, such as mediating inflammation and regulating various bodily functions. Leukotrienes, another class of eicosanoids, are involved in immune responses and play a significant role in allergic reactions and asthma. Thromboxanes are also derived from arachidonic acid and are involved primarily in platelet aggregation and vasoconstriction during blood clotting.

Thyroid stimulating hormone (TSH), however, is not an eicosanoid. It is a peptide hormone produced by the pituitary gland that regulates the production of thyroid hormones from the thyroid gland. TSH does not share the biochemical pathway or structure characteristic of eicosanoids, which is why it is the correct identification as not being an eicosanoid.

Thus, recognizing the distinction between eicosanoids and other types of molecules, such as hormones like T