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: carnivores only eat animals. Question: Carnivores' only source of what comes from other animals?

Output: sustenance


Input: Consider Input: Fact: a hot substance is a source of heat. Question: Lucy came in from the cold and can's stop shivering. It might help her to sit near?

Output: a running boiler


Input: Consider Input: Fact: an animal requires enough nutrients to maintain good health. Question: What requires nutrients to grow and heal?


Output: birds