Question ID:PT28 S3 Q16 Passage:Historian:  We can learn about the medical history of individuals through chemical analysis of their hair. It is likely, for example, that Isaac Newton's psychological problems were due to mercury poisoning; traces of mercury were found in his hair. Analysis is now being done on a lock of Beethoven's hair. Although no convincing argument has shown that Beethoven ever had a venereal disease, some people hypothesize that venereal disease caused his deafness. Since mercury was commonly ingested in Beethoven's time to treat venereal disease, if researchers find a trace of mercury in his hair, we can conclude that this hypothesis is correct. Stem:Which one of the following is an assumption on which the historian's argument depends? Correct Answer Choice:BChoice A:None of the mercury introduced into the body can be eliminated. Choice B:Some people in Beethoven's time did not ingest mercury. Choice C:Mercury is an effective treatment for venereal disease. Choice D:Mercury poisoning can cause deafness in people with venereal disease. Choice E:Beethoven suffered from psychological problems of the same severity as Newton's.