Question ID:PT90 S4 Q24 Passage:Consumer advocate:  Some agricultural crops are now being genetically engineered to produce important pharmaceuticals.  However, this development raises the possibility that the drugs will end up in the general food supply, since if pollen from a drug-producing crop drifts into a nearby field in which an ordinary, non-drug-producing crop of the same species is being grown, the pollen could fertilize that crop and turn it into a drug-producing crop as well. Stem:Which one of the following, if true, would most weaken the consumer advocate's argument? Correct Answer Choice:DChoice A:As far as scientists know, none of the pharmaceuticals produced by genetically engineered crops would present any danger to public health if they were present in the general food supply. Choice B:If pollen from a genetically engineered crop is prevented from drifting into fields in which ordinary crops of the same species are being grown, then there is no risk of the pollen fertilizing the latter crops. Choice C:The genetically engineered crops that produce pharmaceuticals are not among the crop species that comprise the largest portions of the general food supply. Choice D:In crops genetically engineered to produce pharmaceuticals, the drugs are not present in any part of the plant used for food in ordinary crops of the same species. Choice E:If pollen from a drug-producing crop turned an ordinary crop of the same species into a drug-producing crop, it would be possible for scientists to identify the latter crop.