Final answer:
Sevoflurane is an inhalation agent used for general anesthesia.
Step-by-step explanation:
The inhalation agent used for general anesthesia is Sevoflurane. It is one of the most widely used volatile anesthetics today, along with Desflurane and Isoflurane. These agents are administered as gases or vapors through an anesthesia machine, which allows for the delivery of a mixture of oxygen, anesthetics, and ambient air to the patient.