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

[EX Q]: statement: meteorologists study weather, question: Who study weather?
[EX A]: meteorologists

[EX Q]: statement: brain signals are electrical in practice., question: What type of brain signals are in practice?
[EX A]: electrical

[EX Q]: statement: optical instruments help explain the natural world, question: What helps explain the natural world?
[EX A]:
optical instruments