(D) Kinetin is a synthetic cytokinin. It is a derivative of adenine ($6$-furfurylaminopurine) and was discovered from autoclaved herring sperm $DNA$.

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(D) Kinetin is a synthetic cytokinin. It is a derivative of adenine ($6$-furfurylaminopurine) and was discovered from autoclaved herring sperm $DNA$. It does not occur naturally in plants. Other options like Abscisic acid,Gibberellins,and Auxin are naturally occurring plant growth regulators.