Given a statement and question, generate the answer to the question such that the answer is contained in the statement.

[Q]: statement: A radio is used for exchange of knowledge., question: What is a radio used for?
[A]: exchange of knowledge


[Q]: statement: Male mealybugs have two pairs of wings for flight, question: How many pairs of wings do mealybugs have?
[A]: two pairs


[Q]: statement: algae plays significant roles as food in water ecosystems, question: What plays a significant role as food in water ecosystems?
[A]:
algae