Which of the following is NOT included in the definition of alcohol?

Ethanol is the type of alcohol commonly found in beverages and is the primary substance recognized as alcohol for legal and regulatory purposes. Methanol and isopropanol, while also classified as alcohols chemically, are not typically involved in the context of legal impairment or intoxication assessments, which focus on ethanol.

Ethylene glycol is not classified as an alcohol in the context of intoxication or impairment because it is primarily used as an antifreeze and has different chemical properties and effects on the human body. Its inclusion in the definition of alcohol would not be appropriate within the scope of substance use and motor vehicle law as it pertains to impairment and legal limits for drivers. Thus, ethylene glycol is the correct choice for what is NOT included in the definition of alcohol relative to driving laws and regulations.