instruction:
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.
question:
the gandaki river is one of the major rivers of nepal.
answer:
gandaki river


question:
the channel catfish (scientific name:"ictalurus punctatus"), also called the channel cat, is a species of catfish.
answer:
channel catfish


question:
the thalamus is a symmetrical structure in the brains of vertebrates.
answer:

thalamus