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.

Example Input: 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.
Example Output: polly bergen

Example Input: stinging nettles ("urtica dioica") are a type of plant which have stinging defensive hairs on the leaves and stems.
Example Output: stinging nettle

Example Input: adriana benetti (12 december 1919 – 24 february 2016) was an italian actress.
Example Output:
adriana benetti