Question ID:PT90 S4 Q13 Passage:Medical researcher: A new screening test detects certain polyps at such an early stage that it is generally unclear whether the polyps are malignant. But the risk that a polyp might be malignant leads doctors, in most cases, to have such polyps surgically removed, which is a dangerous process. Yet some of those polyps turn out not to be malignant. Thus, the new screening test can prompt dangerous operations that actually are not medically necessary. Stem:Which one of the following is an assumption that the medical researcher's argument requires? Correct Answer Choice:BChoice A:A surgical operation that is dangerous is ethically justified only for treating a medical condition that is more dangerous. Choice B:Surgical removal of nonmalignant polyps detected by the new screening test is not always medically necessary. Choice C:If the new screening test encourages medically unnecessary operations, then probably it either should not be used or its use should be modified. Choice D:A polyp detected by the new screening test should be surgically removed if it is malignant. Choice E:The screening test is medically useful only when it detects a polyp that requires treatment.