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.

[EX Q]: Fact: sand dunes are made of sand. Question: Obstacles that might impede a dune are?
[EX A]: cacti

[EX Q]: Fact: as altitude increases , the temperature of the air will decrease. Question: As altitude increases, the air temperature will do what?
[EX A]: nosedive

[EX Q]: Fact: In the food chain process a green plant has the role of producer. Question: Plants are called producers because they may produce their own?
[EX A]:
sustenance