TASK DEFINITION: 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.
PROBLEM: diana ross is a famous american soul and pop singer.

SOLUTION: diana ross

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

SOLUTION: thalamus

PROBLEM: a shooter is a kind of video game.

SOLUTION:
shooter