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

question:
summerslam (2001) was a professional wrestling pay-per-view show made by world wrestling federation (wwf).
answer:
summerslam (2001)

question:
a type rating is an authorization to fly a certain aircraft type that requires additional training.
answer:
type rating