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.

Q: felix yusupov was never punished for this murder.

A: felix yusupov
****
Q: plankton are drifting organisms that live in the surface layers of the ocean.

A: plankton
****
Q: leslie grantham (30 april 1947 15 june 2018) was a british actor and convicted murderer.

A:
leslie grantham
****