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: ernest evans (born october 3, 1941) better known as chubby checker, is a pop singer from the united states.

A: chubby checker
****
Q: maryam durani (مَریَم دورانی) (born 1987) is an activist and women's advocate.

A: maryam durani
****
Q: lukas ammann (september 29, 1912 – may 3, 2017) was a swiss retired actor.

A:
lukas ammann
****