Answer the following question given this paragraph: 

The oxidation of an alcohol can produce either an aldehyde or a ketone. Ethanol can be oxidized in the laboratory through a heating process combined with the addition of an oxidizing agent such as the dichromate ion, which catalyzes the reaction in an acidic solution. The reaction produces the aldehyde ethanal (acetaldehyde).


Q: The oxidation of an alcohol can produce either an aldehyde or what?


A:
ketone