题目选项分析

In countries in which new life-sustaining drugs cannot be patented, such drugs are sold at widely affordable prices; those same drugs, where patented, command premium prices because the patents shield patent-holding manufacturers from competitors. These facts show that future access to new life-sustaining drugs can be improved if the practice of granting patents on newly developed life-sustaining drugs were to be abolished everywhere. Which of the following, if true, most seriously weakens the argument?

【选项】Countries that grant patents on life-sustaining drugs almost always ban their importation from countries that do not grant such patents.