Determine the topic of the question. Question: "how do pineapples grow?" Topic:
Ans: Pineapple

Determine the topic of the question. Question: "when did lucy stone died?" Topic:
Ans: Lucy Stone

Determine the topic of the question. Question: "how are glacier caves formed??" Topic:
Ans: Glacier cave

Determine the topic of the question. Question: "what is the use of a sales invoice??" Topic:
Ans: Invoice