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.

Q: nellie paulina burgin (july 14, 1930 – september 20, 2014), better known by her stage name polly bergen, was an american actress, singer, television host, and businesswoman.

A: polly bergen
****
Q: oghi is a town in mansehra district, of khyber pakhtunkhwa province of pakistan.

A: oghi
****
Q: the green economy is defined as an economy that results in reducing environmental risks and ecological scarcities.

A:
green economy
****