In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.
--------
Question: Fact: an automobile engine transforms chemical energy into mechanical energy.

Answer: automobile engine.


Question: Fact: x-rays are used in medical technology.

Answer: medical technology helps.


Question: Fact: Plastics are made from petroleum and produce toxic waste.

Answer:
Plastic waste.