Q: Determine the topic of the question-answer pair. Question: "how deep can be drill for deep underwater?"; Answer: "Deepwater drilling is the process of oil and gas exploration and production in depths of more than 500 feet."? Topic:
A: Deepwater drilling

Q: Determine the topic of the question-answer pair. Question: "how many land rovers have landed on mars?"; Answer: "There have been four successful robotically operated Mars rovers."? Topic:
A: Mars rover

Q: Determine the topic of the question-answer pair. Question: "what day is the federal holiday for Martin Luther King Jr.?"; Answer: "It is observed on the third Monday of January each year, which is around the time of King's birthday, January 15."? Topic:
A: Martin Luther King, Jr. Day

Q: Determine the topic of the question-answer pair. Question: "what is the average american income?"; Answer: "U.S. median household income fell from $51,144 in 2010 to $50,502 in 2011."? Topic:
A:
Household income in the United States