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

Example Input: Passage: When a fluorine atom gains an electron, it becomes a negative fluoride ion. Answer: fluoride ion
Example Output: When a fluorine atom gains an electron, it becomes a negative what?

Example Input: Passage: The stoichiometry of a reaction describes the relative amounts of reactants and products in a balanced chemical equation. A stoichiometric quantity of a reactant is the amount necessary to react completely with the other reactant(s). If a quantity of a reactant remains unconsumed after complete reaction has occurred, it is in excess. The reactant that is consumed first and limits the amount of product(s) that can be obtained is the limiting reactant. To identify the limiting reactant, calculate the number of moles of each reactant present and compare this ratio to the mole ratio of the reactants in the balanced chemical equation. The maximum amount of product(s) that can be obtained in a reaction from a given amount of reactant(s) is the theoretical yield of the reaction. The actual yieldis the amount of product(s) actually obtained in the reaction; it cannot exceed the theoretical yield. The percent yield of a reaction is the ratio of the actual yield to the theoretical yield, expressed as a percentage. Answer: in excess
Example Output: If a quantity of a reactant remains unconsumed after complete reaction has occurred, it is?

Example Input: Passage: Sugars are small, simple carbohydrates that are found in foods such as fruits and milk. The sugar found in fruits is called fructose. The sugar found in milk is called lactose. These sugars are broken down by the body to form glucose (C 6 H 12 O 6 ), the simplest sugar of all. Answer: glucose
Example Output:
Fructose and lactose are types of sugars broken down by the body to form what, which is the simplest sugar of all?