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

Example Input: Passage: Physical properties include color, density, hardness, and melting and boiling points. Answer: physical
Example Output: Hardness, density, color, and melting and boiling points are all considered what types of properties?

Example Input: Passage: There are a variety of substances in foods that the body needs. Any substance in food that the body needs is called a nutrient. There are six major types of nutrients: carbohydrates, proteins, lipids, water, minerals, and vitamins. Carbohydrates, proteins, and lipids can be used for energy. Proteins also provide building materials. Proteins, minerals, and vitamins help control body processes. Water is needed by all cells just to stay alive. Answer: a nutrient
Example Output: What do you call any substance in food that the body needs?

Example Input: Passage: contain the carbonyl functional group (C=O; part (a) in Figure 24.14 "The Oxidation State of Carbon in Oxygen- and Nitrogen-Containing Functional Groups"). Alcohols are classified as primary, secondary, or tertiary, depending on whether the OH group is bonded to a primary, secondary, or tertiary carbon. For example, the compound 5-methyl-3-hexanol is a secondary alcohol. Answer: diffraction
Example Output:
The bending of a wave around the edges of an opening or an obstacle is called this?