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: fear of needles (medically known as belomophobia) is a term used to describe a large fear (phobia) of medical procedures involving needles.
Example solution: fear of needles
Example explanation: in this statement, we are talking about the fear of needles hence the output of the statement is fear of needles

Problem: a type rating is an authorization to fly a certain aircraft type that requires additional training.

Solution: type rating