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: felix yusupov was never punished for this murder.

SOLUTION: felix yusupov

PROBLEM: lee bowyer (born 3 january 1977) is an english football player.

SOLUTION: lee bowyer

PROBLEM: barnard's loop is an emission nebula in the constellation of orion.

SOLUTION:
barnard's loop