Problem: Please answer a question about the following article about Copper:
Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for healthy growth in rabbits has been reported to be at least 3 ppm in the diet. However, higher concentrations of copper (100 ppm, 200 ppm, or 500 ppm) in the diet of rabbits may favorably influence feed conversion efficiency, growth rates, and carcass dressing percentages.
What amount of copper salt is toxic in animals?
A: 30 mg/kg
Problem: Please answer a question about the following article about Political corruption:
Corruption is often most evident in countries with the smallest per capita incomes, relying on foreign aid for health services. Local political interception of donated money from overseas is especially prevalent in Sub-Saharan African nations, where it was reported in the 2006 World Bank Report that about half of the funds that were donated for health usages were never invested into the health sectors or given to those needing medical attention.
Which report described this corruption? 
A: the 2006 World Bank Report
Problem: Please answer a question about the following article about Asphalt:
The great majority of asphalt used commercially is obtained from petroleum. Nonetheless, large amounts of asphalt occur in concentrated form in nature. Naturally occurring deposits of asphalt/bitumen are formed from the remains of ancient, microscopic algae (diatoms) and other once-living things. These remains were deposited in the mud on the bottom of the ocean or lake where the organisms lived. Under the heat (above 50 °C) and pressure of burial deep in the earth, the remains were transformed into materials such as asphalt/bitumen, kerogen, or petroleum.
How much heat is required for the natural production of asphalt?
A: above 50 °C
Problem: Please answer a question about the following article about Mexico City:
The Greater Mexico City has a gross domestic product (GDP) of US$411 billion in 2011, making Mexico City urban agglomeration one of the economically largest metropolitan areas in the world. The city was responsible for generating 15.8% of Mexico's Gross Domestic Product and the metropolitan area accounted for about 22% of total national GDP. As a stand-alone country, in 2013, Mexico City would be the fifth-largest economy in Latin America—five times as large as Costa Rica's and about the same size as Peru's.
How much bigger is Mexico City's GDP's than Costa Rica's?
A:
five times