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: anton rubinstein (born vikhvatinets 28 november 1829; died petershof 20 november 1894) was a russian pianist and composer.

SOLUTION: anton rubinstein

PROBLEM: ammonium carbonate, also known as baker's ammonia or sal volatile, is a chemical compound.

SOLUTION: ammonium carbonate

PROBLEM: the colognian dialect, or kölsch is a variety of the german languages.

SOLUTION:
colognian dialect