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.

[Q]: click beetle is the common name for beetles in the family elateridae.
[A]: click beetle

[Q]: the nemean lion ( ""; latin: "leo nemaeus") was a vicious monster in greek mythology that lived at nemea.
[A]: nemean lion

[Q]: radiography is the name for the use of x-rays to see what is happening to parts of the body.
[A]:
radiography