7. (B)
Question type: Identify the Flaw
The flaw in this argument is that the author reaches a conclusion based on limited evidence, without considering a primary issue: what are the benefits of the drugs? What would happen if the people who need this drugs stopped using them? Perhaps the consequences would be far worse than the side effects are. Therefore, (B) is the correct answer.
(A) is incorrect because the clause does not need to be more specific.
(C) is incorrect because it is outside the scope of the argument.
(D) is incorrect because it is outside the scope of the argument.
(E) is incorrect because such an acknowledgement is unnecessary.