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.
--------
Question: Fact: crop rotation has a positive impact on soil quality. Question: The field a farmer plants with varied crops over the years is richer than?

Answer: a field where only grain is planted


Question: Fact: an oven is a source of heat. Question: during the winter, a man's central heating stops functioning. Which of these could be a lifeline?

Answer: leaving the oven lid open


Question: Fact: carbon dioxide concentrations in the air have increased over the last decade dramatically. Question: Which likely increased atmospheric CO2 recently?

Answer:
motorcycles