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 Input:
a standing start is a type of start in auto racing events where cars are standing still when the race begins.

Ex Output:
standing start


Ex Input:
bernhard rensch (21 january 1900–4 april 1990) was a german evolutionary biologist, and ornithologist who did field work in indonesia and india.

Ex Output:
bernhard rensch


Ex Input:
joseph lister, 1st baron lister, (5 april 182710 february 1912) was a british surgeon and a pioneer of antiseptic surgery.

Ex Output:

joseph lister