Problem: Determine the topic of the passage. "According to the World Health Organization (WHO), the United States spent more on health care per capita ($7,146), and more on health care as percentage of its GDP (15.2%), than any other nation in 2008." Topic:

A: Health care in the United States


Problem: Determine the topic of the passage. "The Geothermal energy of the Earth's crust originates from the original formation of the planet (20%) and from radioactive decay of minerals (80%)." Topic:

A: Geothermal energy


Problem: Determine the topic of the passage. "An otoacoustic emission (OAE) is a sound which is generated from within the inner ear ." Topic:

A: Otoacoustic emission


Problem: Determine the topic of the passage. "At the turn of the 21st century, the expanding domain of economics in the social sciences has been described as economic imperialism ." Topic:

A:
Economics