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

Input: Consider Input: Passage: When fuel is burned, most of the energy is released as heat. Some of this heat can be used to do work. Heat cooks food or warms your house. Sometimes the heat is just waste heat. It still heats the environment, though. Answer: heat

Output: When fuel is burned, most of the energy is released in what form?

Input: Consider Input: Passage: Cloning is the process of creating an exact genetic replica of an organism. The clone's DNA is exactly the same as the parent's DNA. Bacteria and other single-celled organisms have long been able to clone themselves through asexual reproduction. Plants can also reproduce asexually. In animals, however, cloning does not happen naturally. In 1997, that all changed when a sheep named Dolly was the first large mammal ever to be successfully cloned. Other animals can now also be cloned in a laboratory. Answer: cloning

Output: What is the process of creating an exact genetic replica of an organism called?

Input: Consider Input: Passage: Acids can be classified as monoprotic or polyprotic based on the number of acidic hydrogens they contain. Answer: acids
Output: What can be classified as monoprotic or polyprotic based on the number of acidic hydrogens they contain?