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

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

[Q]: statement: mammals require food in order to run, question: What do mammals require to run?
[A]: food

[Q]: statement: respiration is aided by open doors, question: What aids respiration?
[A]:
open doors