Question ID:PT12 S1 Q16 Passage:Salmonella is a food-borne microorganism that can cause intestinal illness. The illness is sometimes fatal, especially if not identified quickly and treated. Conventional Salmonella tests on food samples are slow and can miss unusual strains of the microorganism. A new test identifies the presence or absence of Salmonella by the one piece of genetic material common to all strains. Clearly, public health officials would be well advised to replace the previous Salmonella tests with the new test. Stem:Which one of the following, if true, most substantially weakens the argument? Correct Answer Choice:BChoice A:The new test identifies genetic material from Salmonella organisms only and not from similar bacteria. Choice B:The new test detects the presence of Salmonella at levels that are too low to pose a health risk to people. Choice C:Salmonella is only one of a variety of foodborne microorganisms that can cause intestinal illness. Choice D:The new test has been made possible only recently by dramatic advances in biological science. Choice E:Symptoms of Salmonella poisoning are often mistaken for those of other common intestinal illnesses.