What is chemical name for laughing gas?

Nitrous oxide (N2O) is commonly called laughing gas because it produces euphoria and giggling when inhaled. It has been used as an anesthetic in dentistry and medicine since the 19th century. The other options are different nitrogen oxides or carbon compounds - nitrogen dioxide (NO2) is a brown toxic gas, nitrogen monoxide (NO) is nitric oxide, and carbon monoxide (CO) is a poisonous gas.