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]: las anod is a city in northern somalia.
[A]: las anod


[Q]: patau syndrome affects about one in 25,000 live births.
[A]: patau syndrome


[Q]: the saigon river is a river in vietnam.
[A]:
saigon river