[Q]: The ozone layer helps organisms by protecting them from Sun's ultraviolet radiation. To find the usefulness of ozone layer Mike wanted to see how much ozone are there in the atmosphere. He then collected three samples of atmosphere, sample A sample B, and sample C. Sample A was collected from the upper portion of the stratosphere. Sample B was collected from the lower portion of the stratosphere. Sample C was collected from the lower atmosphere. Given the paragraph above, please answer correctly the following question: Which sample would have higher concentration of ozone, sample A or sample B?
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[A]: sample B

[Q]: Dean and Paul both went to volunteered in Africa. They had a blood test when they came back. Paul had been infected with the HIV virus while Dean was healthy and clean. Given the paragraph above, please answer correctly the following question: Which friend has a virus that is transmitted by contact with infected semen?
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[A]: Paul

[Q]: Mike was preparing for his chemistry exam. To see the chemistry concepts in practice he conducted two tests, test A and test B. In test A he used two liquid reactants evenly dispersed, but in test B he used one liquid reactant and one solid reactant. He was surprised to see that two tests had very different results. Given the paragraph above, please answer correctly the following question: In which test the reactants would have greater surface area to offer for reactions, test A or test B?
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[A]: test A

[Q]: While hiking Bob likes to collect plant specimens. Yesterday, he was hiking along a creek, and was specifically looking for epiphytes. Eventually, he found one, and tagged the specimen as specimen A. To compare specimen A with another plant he collected another plant specimen that was not an epiphyte. He tagged that specimen as specimen B. Given the paragraph above, please answer correctly the following question: Which specimen may get the benefit of its elevation for pollination, specimen A or specimen B?
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[A]:
specimen A