Problem: Determine the topic of the question. Question: "how much does united states spend on health care?" Topic:

A: Health care in the United States


Problem: Determine the topic of the question. Question: "what is the source of geothermal energy?" Topic:

A: Geothermal energy


Problem: Determine the topic of the question. Question: "what is evoked otoacoustic emissions?" Topic:

A: Otoacoustic emission


Problem: Determine the topic of the question. Question: "What is an economic feature??" Topic:

A:
Economics