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: Pneumonia may be caused by an infection or injury of the lungs.

Output: Pneumonia.


Input: Consider Input: Fact: Climate is generally described in terms of temperature and moisture.

Output: Moisture in  air.


Input: Consider Input: Fact: a balance is used for measuring mass of an object.


Output: a balance measure weight.