Which component is NOT a type of artificial nail?

Natural nails are the correct choice as they are the original, unaltered structure that grows naturally at the tips of fingers and toes. Unlike the other options, which represent enhancements or modifications made to the natural nail, natural nails do not involve any artificial components or techniques to alter their appearance or functionality.

Gel nails, silk nails, and plastic nails are all considered types of artificial nails. Gel nails are made from a type of resin that is cured under a UV lamp, providing a durable and shiny finish. Silk nails involve applying thin layers of silk fabric to strengthen and protect the natural nail, often combined with a bonding agent. Plastic nails, often referred to as acrylics, are pre-formed nails made from a synthetic material that are adhered to the natural nail. These options all aim to enhance or alter the natural nail, distinguishing them from the unmodified state of natural nails.