The human body’s blood vessels and veins are designed to keep fluid inside of them and out of the skin. A person can have a hive outbreak when the fluid escapes the blood vessels or veins and pools under the skin causing swelling. Hives can occur due to allergic reactions to common items.
Which of the following, if true, points to the most serious flaw of a plan to develop a medication that would prevent hive attacks by blocking receipt of any messages of histamine to blood vessels?
(A) Researchers do not yet know how the body produces the message that histamine is present and triggers hive attacks.
(B) Researchers do not yet know what makes one person break out in hives from a histamine attack when another person does not
(C) Such a medication would not become available for several years, because of long lead times in both development and manufacture.
(D) Such a medication would be unable to distinguish between messages trigged by different allergens
(E) Such a medication would be a preventive and would be unable to alleviate hives that had already started
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