Which of the following is an anesthetic?

Novocain, also known as procaine, is a local anesthetic that is commonly used to numb specific areas of the body to prevent pain during dental procedures and minor surgeries. It works by blocking nerve signals in the areas where it is applied, allowing patients to undergo procedures without experiencing discomfort.

In contrast, the other options do not serve as anesthetics. Phenobarbital is a barbiturate used primarily as an anticonvulsant or sedative, but it does not provide local anesthesia. Benzedrine, which contains amphetamine, is primarily used as a stimulant and is not related to anesthesia at all. Witch Hazel is a natural astringent derived from the witch hazel plant and is often used for its soothing properties on skin irritations but has no anesthetic effects.