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: an air raid is an attack in which bombs are dropped from aircraft on to a ground or sea target.

SOLUTION: air raid

PROBLEM: the beethoven house (german: beethoven-haus) in bonn, germany, is a memorial site, museum and cultural institution serving various purposes.

SOLUTION: beethoven house

PROBLEM: the institute for research on public policy (irpp; ) is canada's oldest non-partisan public policy think tank.

SOLUTION:
institute for research on public policy