In this task, you are given a fact statement and question based on the fact. Your task is to generate the correct answer for the question. The answer needs to be generated using the context fact statement.

Input: Consider Input: Fact: a plant 's roots slowly break down rocks as the roots grow. Question: What is the most likely cause of split rocks on a mountain slope?

Output: pine tree roots


Input: Consider Input: Fact: riding a bike does not cause pollution. Question: Riding a two wheeled human powered vehicle is good for the environment because?

Output: it runs without fuel


Input: Consider Input: Fact: when a sound is produced inside of a room , there is sometimes an echo after the sound. Question: Clapping in an auditorium will yield this for a few moments afterwards:?


Output: echo