text: <unk>  (also called dinitrogen<unk>  or dinitrogen monoxide, or sometimes laughing gas) is a chemical compound with the chemical formula<unk> . At room temperature, it is a colorless non-flammable gas, with a pleasant, slightly sweet odor and taste. It is used in surgery and dentistry for its anaesthetic and analgesic effects. It is commonly known as "laughing gas" due to the euphoric effects of inhaling it, a property that has led to its non-medical use as an inhalant drug. It is also used in motor racing as an<unk> zer to increase the power output of engines. Oftentimes it is incorrectly referred to as "NOS," refrencing a manufacturer of automotive<unk>  equipment,<unk>  Systems.<unk>  <unk>  is a dissociative drug that can cause analgesia, depersonalization, derealization, dizziness, euphoria, flanging of sound, slight hallucinations and neurotoxicity.
option_0: Nitrous oxide
option_1: Nitrosamine
option_2: Nitrogen oxide
option_3: Xylene
option_4: Benzene
option_5: Nitrobenzene
option_6: Ether
option_7: Acrolein