Determine the topic of the question. Question: "what is the singer Stevie Wonders full name?" Topic:
Ans: Stevie wonder

Determine the topic of the question. Question: "what is cta used for?" Topic:
Ans: Computed tomography angiography

Determine the topic of the question. Question: "what caused the world war 2?" Topic:
Ans: Causes of World War II

Determine the topic of the question. Question: "how many presidents have been assassinated?" Topic:
Ans: List of United States presidential assassination attempts and plots