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.

[EX Q]: an air raid is an attack in which bombs are dropped from aircraft on to a ground or sea target.
[EX A]: air raid

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

[EX Q]: garbage truck also known as dustcart, rubbish truck, dustbin lorry, bin lorry is a truck made to collect waste and then take it to a waste site such as a landfill.
[EX A]:
garbage truck