Which is not an example of a licensed entity allowed to possess a dangerous drug?

The correct answer is based on the understanding of regulated entities under health and safety laws. A licensed entity that can possess dangerous drugs is typically one that is authorized and trained to handle such substances in a manner compliant with legal and safety regulations.

Wholesalers and pharmacists are both licensed professionals who handle drugs as part of their roles in the healthcare and pharmaceutical industry. Researchers also have the necessary licenses and permissions to handle dangerous drugs for scientific and medical studies, operating under strict regulations to ensure safety and proper usage.

In contrast, an amateur surveyor does not fall into a category of professionals authorized to handle or possess dangerous drugs. This role does not require any licensing or training related to the handling of pharmaceuticals, making it an unsuitable choice when considering entities that are legally permitted to possess dangerous drugs. Thus, the amateur surveyor is the only option that does not comply with the licensing requirements established for handling dangerous drugs.