Which of the following is NOT a disinfectant?

Novacaine is classified as a local anesthetic, primarily used to provide temporary pain relief during medical or dental procedures. Unlike disinfectants, which are used to eliminate or reduce harmful microorganisms on surfaces or skin, Novacaine does not possess disinfectant properties. It is designed to block nerve signals in a specific area, helping to manage pain, rather than killing or inhibiting the growth of pathogens.

In contrast, boiling water, iodine, and formaldehyde are all recognized disinfectants. Boiling water can effectively kill pathogens due to the high temperature, making it a simple yet effective method for disinfection. Iodine, particularly in the form of tinctures or solutions, is widely used for antisepsis and disinfecting skin prior to procedures. Formaldehyde is a powerful disinfectant that is often used for sterilizing equipment and preserving biological specimens. Each of these substances serves a different purpose in infection control compared to the role of Novacaine.