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: lee soo-young (born lee ji-yeon april 12, 1979) is a korean ballad singer.

SOLUTION: lee soo-young

PROBLEM: chumbawamba were a british alternative rock group.

SOLUTION: chumbawamba

PROBLEM: walter rudolf hess (17 march 1881 – 12 august 1973) was a swiss physiologist.

SOLUTION:
walter rudolf hess