Two twin brothers had very different blood pressures. Tom had very high blood pressure, while Dan had low blood pressure. Given the paragraph above, please answer correctly the following question: Which brother had hypertension?
Ans: Tom

Scientists studied two island. One with an old ecosystem named Old island, and the other with a newly formed and forming ecosystem named New island. Both islands were inhabited, Old island being heavily inhabited. Given the paragraph above, please answer correctly the following question: Which island had a more stable ecosystem factoring in the population?
Ans: New

Two sisters went to the hospital. The medics ran some blood tests and found out that Sue had sickle cell trait, while Mary had normal blood cells. Sue received treatment. Given the paragraph above, please answer correctly the following question: Which sister has a genetic abnormality?
Ans: Sue

There is a strange phenomenon going on in Siberia. Biologist noticed that 60 percent of the Siberian Tigers have leucism, and another 40 percent have albinism. They labeled the first group as group A and the latter one as group B. They need to find the reasons for this phenomenon. Given the paragraph above, please answer correctly the following question: Which group would have multiple types of reduced pigment?
Ans: group A