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: diana ross is a famous american soul and pop singer.

SOLUTION: diana ross

PROBLEM: ronald ross (13 may 1857 – 16 september 1932) was an english doctor.

SOLUTION: ronald ross

PROBLEM: ralph macchio (born november 4, 1961 in huntington, new york) is an american actor.

SOLUTION:
ralph macchio