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.

Example Input: Fact: when a metal rusts , that metal becomes orange on the surface.
Example Output: metal iron.

Example Input: Fact: Most pituitary hormones control other endocrine glands.
Example Output: Endocrine glands are.

Example Input: Fact: pesticides can cause pollution.
Example Output:
pesticides are.