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]: louise leakey (born 21 march 1972) is a kenyan paleontologist.
[EX A]: louise leakey

[EX Q]: the channel catfish (scientific name:"ictalurus punctatus"), also called the channel cat, is a species of catfish.
[EX A]: channel catfish

[EX Q]: valle del cauca is one of the 32 departments of colombia.
[EX A]:
valle del cauca