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]: gauchin-verloingt is a commune.
[A]: gauchin-verloingt


[Q]: mariner 10 was a robotic nasa space probe.
[A]: mariner 10


[Q]: the five families are the five major italian-american mafia crime families which have controlled organized crime in new york city since the 1930s.
[A]:
five families