In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

Q: Soil contamination or soil pollution as part of land degradation is caused by the presence of xenobiotic (human-made) chemicals or other alteration in the natural soil environment. It is typically caused by industrial activity, agricultural chemicals, or improper disposal of waste. The most common chemicals involved are petroleum hydrocarbons, polynuclear aromatic hydrocarbons (such as naphthalene and benzo (a) pyrene), solvents, pesticides, lead, and other heavy metals. Contamination is correlated with the degree of industrialization and intensity of chemical usage.

A: how does land pollution lead to soil degradation
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Q: The Secretary of the Treasury pays a taxable pension to the president. Former presidents receive a pension equal to the pay that the head of an executive department (Executive Level I) would be paid, as of 2017 $207,800 per year. The pension begins immediately after a president's departure from office. A former president's spouse may also be paid a lifetime annual pension of $20,000 if they relinquish any other statutory pension.

A: pension of the president of the united states
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Q: On 6 April 1814, Napoleon abdicated his throne, leading to the accession of Louis XVIII and the first Bourbon Restoration a month later. The defeated Napoleon was exiled to the island of Elba off the coast of Tuscany, while the victorious Coalition sought to redraw the map of Europe at the Congress of Vienna.

A:
who ruled for one hundred days and when
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