TASK DEFINITION: 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.
PROBLEM: hair straightening is when a person makes their hair straighter.

SOLUTION: hair straightening

PROBLEM: the 7 july 2005 london bombings (also called 7/7) were suicide bomb attacks aimed at london's public transport system during the morning rush hour.

SOLUTION: 7 july 2005 london bombings

PROBLEM: the man who knew too much is a 1934 suspense movie directed by alfred hitchcock and released by the gaumont british company.

SOLUTION:
the man who knew too much