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.

Input: Consider Input: Fact: keeping food cold is used for keeping food fresh.

Output: food cold safety.


Input: Consider Input: Fact: an automobile engine transforms chemical energy into mechanical energy.

Output: automobile engine.


Input: Consider Input: Fact: seat belts are used for preventing injuries to passengers in cars.


Output: car accidents can cause death.