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

Ex Input:
Passage: A lens that causes the light rays to bend away from its axis is called a diverging lens. Ray tracing is the technique of graphically determining the paths that light rays take. The image in which light rays from one point on the object actually cross at the location of the image and can be projected onto a screen, a piece of film, or the retina of an eye is called a real image. Thin lens equations are. Answer: diverging lens

Ex Output:
What do you call a lens that causes the light rays to bend away from its axis?

Ex Input:
Passage: For feeding, the insect head contains one pair of lower jaws and two pairs of upper jaws. Insects have also evolved a wide range of specialized mouthparts for eating certain foods. You can see some examples in Figure below . Answer: two pairs

Ex Output:
How many pairs of upper jaws do insects have?

Ex Input:
Passage: Gap genes control the expression of other genes within specific regions of cells in the developing organism. This allows specific genes to be expressed in certain cells at the appropriate stage of development. Answer: gap genes

Ex Output:
What is the term for genes that control the expression of other genes within specific regions of cells in the developing organism?