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

Example Input: Passage: rates The rates at which reactants are consumed and products are formed during chemical reactions vary greatly. We can identify five factors that affect the rates of chemical reactions: the chemical nature of the reacting substances, the state of subdivision (one large lump versus many small particles) of the reactants, the temperature of the reactants, the concentration of the reactants, and the presence of a catalyst. Answer: catalyst
Example Output: The presence of what, which acts as a trigger, affects the rate of chemical reaction?

Example Input: Passage: Graphs are very useful tools in science because they display data visually. Three commonly used types of graphs are bar graphs, circle graphs, and line graphs. Each type of graph is suitable for a different type of data. Answer: graphs
Example Output: Bar, circle, and line are examples of what kind of data visualization?

Example Input: Passage: Although there is actually little difference between toads and frogs, this animal would most often be called a toad. Frogs have moist skin, while toads have dry, bumpy skin. Answer: toads
Example Output:
Moist skin distinguishes frogs from what animal with dry, bumpy skin?