Final answer:
The end product of catecholamine metabolism is Vanillylmandelic acid (VMA).
Step-by-step explanation:
The end product of catecholamine metabolism is Vanillylmandelic acid (VMA), which is the major excretory product of catecholamines. Catecholamines, such as epinephrine (adrenaline), norepinephrine (noradrenaline), and dopamine, are metabolized by enzymes like Catechol-O-Methyl-Transferase (COMT) and Mono-Amine Oxidase (MAO) in the liver to form O-methylated and deaminated metabolites. VMA is one of these metabolites that is excreted by the body.