Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Example Input: click beetle is the common name for beetles in the family elateridae.
Example Output: click beetle

Example Input: doriva (born 28 may 1972) is a former brazilian football player.
Example Output: doriva

Example Input: the napoleonic code ‒ or code napoléon, officially the code civil des français ‒ is the french civil code established under napoléon i in 1804.
Example Output:
napoleonic code