In this task, you are given a statement spoken by a politician in natural language. Your task is to generate the subject of the discussion for the given statement. The subject generated is not necessarily a part of the given input. Your answer should contain one or more words.

Q: Currently it costs more than a penny for the U.S. Mint to make a one cent coin and more than a nickel to make the five cent piece.

A: economy
****
Q: Al-Qaida operatives, have said, Hey, we want you to use this loophole (for purchasing guns despite being on a watch list) to attack and kill Americans.

A: crime
****
Q: The U.S. spends $4 billion on research and development for energy, while spending $350 billion on oil from foreign countries, "many of whom are our enemies."

A:
energy
****