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.

[EX Q]: hans nowak (born 9 august, 1937) is a former german football player.
[EX A]: hans nowak

[EX Q]: ayman al-zawahiri is a former member of islamist organizations which have organised and carried out attacks in north america, asia, africa and the middle east.
[EX A]: ayman al-zawahiri

[EX Q]: chesalles-sur-moudon is a former municipality in the district broye-vully in the canton of vaud in switzerland.
[EX A]:
chesalles-sur-moudon