Q: Which hormone is synthesized from the amino acid histidine?  

Answer: A

Histamine is a hormone that is synthesized from the amino acid histidine. Histidine is decarboxylated by the enzyme histidine decarboxylase, which removes the carboxyl group and forms histamine. Histamine is found in many tissues throughout the body and is involved in a wide range of physiological processes, including inflammation and allergic reactions.
In contrast, epinephrine, norepinephrine, and dopamine are amine hormones that are synthesized from the amino acid tyrosine. These hormones are synthesized by modifying tyrosine through a series of enzymatic reactions. Epinephrine and norepinephrine are synthesized by the adrenal glands and are involved in the body's "fight or flight" response, while dopamine is synthesized in the brain and is involved in regulating mood, behavior, and movement.

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