5. Animals with a certain behavioral disorder have unusually high level of aluminum in their brain tissue. Since a silicon-based compound binds to aluminum and prevents it from affecting the brain tissue. Animals can be cured of the disorder by being treated with the compound.
The argument is based on which one of the following assumptions?
(A) Animals with the disorder have unusually high but invariable levels of aluminum in their brain tissue.
(B) Aluminum is the cause of the disorder rather than merely an effect of it.
A trap. Irrespective of whether Aluminium is the cause of effect, we dont want that to affect the brain tissue. Hence, we are not concerned about Aluminium as a cause or effect when we are deciding about silicon usage.
(C) Introducing the compound into the brain tissue has no side effects.
My answer. If introducing silicon causes some other side effects, its introduction can't be justified.
(D) The amount of the compound needed to neutralize the aluminum in an animalâ€™s brain tissue varies depending upon the species.
(E) Aluminum is never present in normal brain tissue.
Hey, now I understand. I did not pay attention to the word "silicon based compound".
That means the compound is a derivative of silicon. Hence there is no scope of silicon causing side effects since, that is the cure. They must have thought about the side effects before introducing that as a medicine. Hence, side effect is out side the scope of the argument.
As they are not using silicon, but silicon based compound we can take B as the answer. The argument says "prevents it from affecting the brain tissue". That means Aluminum is affecting the brain tissue, and there is no point in stopping it from affecting brain tissue unless Aluminum is affecting behavior subsequently. Aluminum might cause some other damage by affecting brain tissue (make them rust and make the individual unfit for gmat
) , but that is not covered in the argument, hence we can ignore that possibility...I guess.
The path is long, but self-surrender makes it short;
the way is difficult, but perfect trust makes it easy.