Part 1. Definition
Given a passage and a question, find the answer to the question based on the passage. The answer should consist of only one word that lies in the span of only one of the sentences in the passage.
Part 2. Example
Paragraph: Nix v. Hedden , 149 U.S. 304 ( 1893 ) , was a decision by the Supreme Court of the United States that , under U.S. customs regulations , the tomato should be classified as a vegetable rather than a fruit . The Court 's unanimous opinion held that the Tariff Act of 1883 used the ordinary meaning of the words `` fruit '' and `` vegetable , '' instead of the technical botanical meaning .
Question: is tomato a fruit or vegetable us supreme court

Answer: vegetable
Explanation: The answer 'vegetable' is correct as it lies in the sentence - "Nix v. Hedden , 149 U.S. 304 ( 1893 ) , was a decision by the Supreme Court of the United States that , under U.S. customs regulations , the tomato should be classified as a vegetable rather than a fruit ", which is a part of the passage.
Part 3. Exercise
Paragraph: The working income tax benefit ( WITB ) is a refundable tax credit in Canada , similar to the Earned Income Tax Credit ( EITC ) in the United States . Introduced in 2007 , it offers tax relief to working low - income individuals and encourages others to enter the workforce . The WITB has been expanded considerably since its introduction .
Question: when did the working income tax benefit come into effect

Answer:
2007