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

Ex Input:
Passage: Carbohydrates include sugars, starches, and fiber. Sugars and starches are used by the body for energy. One gram of sugar or starch provides 4 Calories of energy. Fiber doesn't provide energy, but it is needed for other uses. At age 13 years, you need about 130 grams of carbohydrates a day. Figure below shows good food sources of each type. Answer: 4

Ex Output:
How many calories of energy does one gram of sugar or starch provide?

Ex Input:
Passage: Potential energy is energy that is stored in a person or object. Answer: potential energy

Ex Output:
Energy that is stored in a person or object is called?

Ex Input:
Passage: The attraction of oppositely charged ions caused by electron transfer is called an ionic bond. Answer: ionic bond

Ex Output:
What is the attraction of oppositely charged ions caused by electron transfer called?