[Q]: David works for a large pharmaceutical company as a research scientist. He has devised a procedure which can detect lactose intolerance in patients easily. To test his procedure he picked up four subjects form a large pool of sample. The four subjects are subject A, subject B, subject C, and subject D. Subject A has primary lactose intolerance; subject B has secondary lactose intolerance; subject C has developmental lactose intolerance; and subject D has congenital lactose intolerance. Would subject A be younger or older than subject C?
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[A]: older

[Q]: Barbara and Jane are two students. They both like meteorology. Barbara studies the formation of the ozone layer, while Jane studies about the stratosphere. Which student learned more about radicals produced from homolytically split oxygen molecules?
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[A]: Barbara

[Q]: Two brothers liked natural sciences. Ben decided to study Ecology, while his brother Dan decided to study Geography. They studied a lot and became very good at these subjects. Which brother studied more ecosystems?
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[A]: Ben

[Q]: There are two rocks that scientists are looking at. Rock A is located near the lava stored in an active volcano, and rock B is outside this volcano near the base of it. The scientists are currently trying to find a way to safely transport both rocks back to a lab so they can get these rocks under a microscope to look at them. However, they are currently struggling to figure out an effective way to lift rock A out of the volcano. Which rock emits more radiation?
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[A]:
Rock A