Which term describes loss of feeling or sensation caused by anesthetic agents?

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Loss of feeling or sensation caused by anesthetic agents is described by the term anesthesia. It covers numbness in a local area, a larger region, or even unconsciousness during surgery, depending on whether a local, regional, or general anesthetic is used. The other terms don’t describe sensation loss: hygiene relates to cleanliness practices, modern times to a time period, and pathogen to a disease-causing organism. So anesthesia best fits the concept.