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

[EX Q]: statement: Air pollution contains lung irritants., question: What does air pollution contain?
[EX A]: lung irritants

[EX Q]: statement: Rain downwind from a coal-fired power plant is likely to transform the color of litmus paper from blue to red., question: What color is litmus paper likely to change from?
[EX A]: blue

[EX Q]: statement: Stimulus is converted to electrical signals., question: Stimulus is converted to what?
[EX A]:
electrical signals