Problem: Determine the topic of the question-answer pair. Question: "how many albums has eminem sold in his career?"; Answer: "He has sold more than 100 million records worldwide, including 42 million tracks and 49.1 million albums in the United States."? Topic:

A: Eminem

Problem: Determine the topic of the question-answer pair. Question: "what causes thunder sound?"; Answer: "In turn, this expansion of air creates a sonic shock wave, similar to a sonic boom , which produces the sound of thunder, often referred to as a clap, crack, or peal of thunder."? Topic:

A: Thunder

Problem: Determine the topic of the question-answer pair. Question: "what is metal music about?"; Answer: "Heavy metal lyrics and performance styles are generally associated with masculinity and machismo ."? Topic:

A: Heavy metal music

Problem: Determine the topic of the question-answer pair. Question: "how much total wealth in USA?"; Answer: "Including human capital such as skills, the United Nations estimated the total wealth of the United States in 2008 to be $118 trillion."? Topic:

A:
Wealth in the United States