Q: Determine the topic of the question. Question: "how deep can be drill for deep underwater?" Topic:
A: Deepwater drilling

Q: Determine the topic of the question. Question: "how many land rovers have landed on mars?" Topic:
A: Mars rover

Q: Determine the topic of the question. Question: "what day is the federal holiday for Martin Luther King Jr.?" Topic:
A: Martin Luther King, Jr. Day

Q: Determine the topic of the question. Question: "what is the average american income?" Topic:
A:
Household income in the United States