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

Example Input: Passage: Figure 6.11 The frictional force supplies the centripetal force and is numerically equal to it. Centripetal force is perpendicular to velocity and causes uniform circular motion. The larger the F c , the smaller the radius of curvature r and the sharper the curve. The second curve has the same v , but a larger. Answer: centripetal force
Example Output: What force is perpendicular to velocity and causes uniform circular motion?

Example Input: Passage: Sperm are produced in the testes in the process of spermatogenesis. Answer: spermatogensis
Example Output: What process creates sperm?

Example Input: Passage: A combination reaction is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions. The general form of a combination reaction is:. Answer: combination reaction
Example Output:
What kind of reaction is a reaction in which two or more substances combine to form a single new substance?