Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Input: Consider Input: in organic chemistry, an epoxide is a molecule that has a ring with at least three atoms in total, two carbon atoms and one oxygen atom.

Output: epoxide


Input: Consider Input: fufu (pounded yam or cassava) is a food dish which first came from west africa, but is enjoyed by many people across the world.

Output: fufu


Input: Consider Input: the cat concerto is the 29th "tom and jerry" animated cartoon.


Output: the cat concerto