<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 72-year-old man presents to his primary care provider complaining of fatigue, mild headache, and discomfort with chewing for roughly 1 week. Before this, he felt well overall, but now is he is quite bothered by these symptoms. His medical history is notable for hypertension and hyperlipidemia, both controlled. On examination, he is uncomfortable but nontoxic-appearing. There is mild tenderness to palpation over his right temporal artery, but otherwise the exam is not revealing. Prompt recognition and treatment can prevent which of the following feared complications:? A: Renal failure, B: Blindness, C: Pericarditis, D: Pulmonary fibrosis, E: Cognitive impairment,  <response>: This is a clinical vignette describing a 72-year-old man with new onset fatigue, headache, and jaw claudication concerning for giant cell arteritis. The question asks about a feared complication of this condition if not promptly recognized and treated. Based on the description, choice B Blindness is the correct answer, as visual loss is a feared complication of giant cell arteritis if not treated urgently with high-dose steroids. Choices A, C, D, and E are not known complications of untreated giant cell arteritis.B: Blindness 