Determine the topic of the question. Question: "what latitude is tropic of cancer?" Topic:
Ans: Tropic of cancer

Determine the topic of the question. Question: "how is a backpack made?" Topic:
Ans: Backpack

Determine the topic of the question. Question: "when the wind blows james patterson?" Topic:
Ans: When the Wind Blows (James Patterson novel)

Determine the topic of the question. Question: "how does a dredge work??" Topic:
Ans: Dredging