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Which of the following pharmaceuticals is regulated federally under the Precursor Control Regulations of the Controlled Drugs and Substances Act, as a precursor chemical for illicit drug use?

  1. Dextromethorphan

  2. Dimenhydrinate

  3. Diazepam

  4. Pseudoephedrine

The correct answer is: Pseudoephedrine

Pseudoephedrine is the correct answer as it is a precursor chemical for the production of methamphetamine, an illicit drug. Dextromethorphan (A) is not regulated federally as it is primarily used as a cough suppressant and has a lower potential for abuse. Dimenhydrinate (B) and Diazepam (C) are not considered precursor chemicals for illicit drug use and therefore, are not regulated under the Precursor Control Regulations of the Controlled Drugs and Substances Act.