Which of the listed measures is NOT a source of medication?

Synthetic polymers are not considered a direct source of medication in the same way that plants, animals, and laboratory synthesis are. Traditional sources of medication often come from natural sources such as plants, which have been used for centuries in herbal remedies, and animals, which can provide substances like hormones or enzymes. Laboratory synthesis, on the other hand, typically refers to the process of creating drugs through chemical reactions, drawing from various compounds and elements.

Synthetic polymers, while they may be used in the production of drug formulations or as drug carriers in some advanced therapeutic techniques, do not represent a natural or traditional source of medication. They are more associated with the manufacturing and engineering aspects of pharmaceuticals rather than as a primary source of active medicinal ingredients themselves.