Given a scientific passage and an answer, generate a question for the given answer.

Example Input: Passage: Opposite charges attract, and like charges repel. Answer: attract
Example Output: What do opposite charges do to one another?

Example Input: Passage: outermost layer of the sun, made up of a plasma that extends millions of kilometers into space. Answer: plasma
Example Output: What is the outer layer of the sun made up of?

Example Input: Passage: Work is directly related to both the force applied to an object and the distance the object moves. It can be represented by the equation: Work = Force Distance. Answer: work
Example Output:
Force times distance is the equation for what?