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Among the options provided, (B) N₂O (Nitrous Oxide) is used as an anesthetic. Nitrous oxide, commonly known as "laughing gas," has been utilized in dentistry and surgery as an anesthetic and analgesic since 1844.
Why not the other options?
(A) CH₄ (Methane): Methane is a hydrocarbon gas primarily used as a fuel and is not employed in medical anesthesia.
(C) CO₂ (Carbon Dioxide): Carbon dioxide is involved in respiratory processes but is not used as an anesthetic.
(D) N₂ (Nitrogen): Nitrogen is an inert gas that makes up a significant portion of Earth's atmosphere but has no anesthetic properties.
Therefore, among the given options, nitrous oxide (N₂O) is the correct answer as it is used as an anesthetic.
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