Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Typically a strong base such as NaOH or KOH is used in this reaction, and dehydration of its namesake products tends to give a conjugated system known as an enal. The hydroxide first removes the acidic alpha-hydrogen, which results in an enolate. The enolate then attacks the starting aldehyde, producing an alkoxide that deprotonates a water molecule and creates the beta-hydroxyaldehyde product. FTP, identify this condensation reaction, the simplest of which produces ethanal, named for the two compounds combined in its product.
Science