Which category describes how a chemical agent enters the body?

• A. Route of entry
• B. Onset effects
• C. Physical state
• D. Persistency

Answer: (A)

The route of entry is what this item is testing. It describes how a chemical agent gets into the body—through inhalation, ingestion, dermal contact, or injection. This classification matters because the entry path determines how much of the agent reaches target organs and influences the protective measures and medical response needed. For example, inhalation lets the agent reach the lungs quickly, while dermal exposure involves skin contact and may require decontamination of the skin and consideration of skin absorption. Onset effects focus on when symptoms appear after exposure, the physical state refers to whether the agent is gas, liquid, or solid (which can affect exposure but not the entry route), and persistency concerns how long the agent remains in the environment.