Problem: Extract the answer to the question from the following context. Question: Why are there higher rates of asthma today? Context: The hygiene hypothesis attempts to explain the increased rates of asthma worldwide as a direct and unintended result of reduced exposure, during childhood, to non-pathogenic bacteria and viruses. It has been proposed that the reduced exposure to bacteria and viruses is due, in part, to increased cleanliness and decreased family size in modern societies. Exposure to bacterial endotoxin in early childhood may prevent the development of asthma, but exposure at an older age may provoke bronchoconstriction. Evidence supporting the hygiene hypothesis includes lower rates of asthma on farms and in households with pets.

A: reduced exposure, during childhood, to non-pathogenic bacteria and viruses

Problem: Extract the answer to the question from the following context. Question: What is at the highest level? Context: The brain contains several motor areas that project directly to the spinal cord. At the lowest level are motor areas in the medulla and pons, which control stereotyped movements such as walking, breathing, or swallowing. At a higher level are areas in the midbrain, such as the red nucleus, which is responsible for coordinating movements of the arms and legs. At a higher level yet is the primary motor cortex, a strip of tissue located at the posterior edge of the frontal lobe. The primary motor cortex sends projections to the subcortical motor areas, but also sends a massive projection directly to the spinal cord, through the pyramidal tract. This direct corticospinal projection allows for precise voluntary control of the fine details of movements. Other motor-related brain areas exert secondary effects by projecting to the primary motor areas. Among the most important secondary areas are the premotor cortex, basal ganglia, and cerebellum.

A: the primary motor cortex

Problem: Extract the answer to the question from the following context. Question: Which of the following is not a city: Bern, Vancouver, or Canada? Context: Bern was a candidate to host the 2010 Winter Olympics, but withdrew its bid in September 2002 after a referendum was passed that showed that the bid was not supported by locals. Those games were eventually awarded to Vancouver, Canada.

A: Canada

Problem: Extract the answer to the question from the following context. Question: What is the Interstate number of the short road that makes a branch from a longer, more important road? Context: Interstate 40 crosses the state in a west-east orientation. Its branch interstate highways include I-240 in Memphis; I-440 in Nashville; I-140 from Knoxville to Alcoa and I-640 in Knoxville. I-26, although technically an east-west interstate, runs from the North Carolina border below Johnson City to its terminus at Kingsport. I-24 is an east-west interstate that runs cross-state from Chattanooga to Clarksville. In a north-south orientation are highways I-55, I-65, I-75, and I-81. Interstate 65 crosses the state through Nashville, while Interstate 75 serves Chattanooga and Knoxville and Interstate 55 serves Memphis. Interstate 81 enters the state at Bristol and terminates at its junction with I-40 near Dandridge. I-155 is a branch highway from I-55. The only spur highway of I-75 in Tennessee is I-275, which is in Knoxville. When completed, I-69 will travel through the western part of the state, from South Fulton to Memphis. A branch interstate, I-269 also exists from Millington to Collierville.

A:
275