Question ID:PT88 S2 Q19 Passage:Doctor: The patient had been experiencing back and leg pain. A computerized scan suggested that there was pressure on a nerve exiting to the leg from a lower vertebra. Such pressure can cause nerve inflammation, which can in turn cause pain. I decided that if the nerve was inflamed, the best way to reduce the inflammation would be a cortisone injection to the nerve, and this, in fact, did result in significant pain relief. I conclude, therefore, that pressure on the nerve in question was causing this patient's back and leg pain.  Stem:Which one of the following is an assumption required by the doctor's argument? Correct Answer Choice:CChoice A:Computerized scans are the most accurate way of diagnosing certain kinds of ailments. Choice B:The cortisone injection did not reduce pressure on the inflamed nerve in the patient's leg.  Choice C:The pain relief did not occur merely through the patient's belief in the efficacy of the cortisone. Choice D:Only cortisone injections can cause a reduction of an inflammation of a nerve like that in the patient's leg. Choice E:The best treatment for back and leg pain is usually a drug that relieves inflammation.