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.

the wrigley building (400-410 north michigan avenue, near north side, chicago, illinois) is a skyscraper in chicago.
wrigley building

the world conference of life and work was an ecumenic conference.
world conference of life and work

heterosociality is a term used in sociology.

heterosociality