<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 44-year-old man comes to the physician because of progressive memory loss for the past 6 months. He reports that he often misplaces his possessions and has begun writing notes to remind himself of names and important appointments. He generally feels fatigued and unmotivated, and has poor concentration at work. He has also given up playing soccer because he feels slow and unsteady on his feet. He has also had difficulty swallowing food over the last two weeks. His temperature is 37.8C 100F, pulse is 82min, respirations are 16min, and blood pressure is 14488 mm Hg. Examination shows confluent white plaques on the posterior oropharynx. Neurologic examination shows mild ataxia and an inability to perform repetitive rotary forearm movements. Mental status examination shows a depressed mood and short-term memory deficits. Serum glucose, vitamin B12 cyanocobalamin, and thyroid-stimulating hormone concentrations are within the reference range. Upper esophagogastroduodenoscopy shows streaky, white-grayish lesions. Which of the following is the most likely underlying cause of this patients neurological symptoms?? A: Cerebral toxoplasmosis, B: Pseudodementia, C: HIV-related encephalopathy, D: Frontotemporal dementia, E: Primary CNS lymphoma,  <response>: Based on the information provided in the question stem, the key findings are:- 44-year-old man with 6 months history of progressive memory loss, misplacing possessions, fatigue, poor concentration, difficulty swallowing, ataxia, inability to perform repetitive movements, short-term memory deficits, depressed mood, and white plaques in the oropharynx and esophagus. - Vital signs are normal except for mildly elevated blood pressure. - Lab tests including glucose, vitamin B12, and TSH are normal.- Upper endoscopy showed streaky white-grayish lesions.The progressive neurological symptoms along with oralesophageal lesions and normal lab tests point towards an infectious or inflammatory cause rather than a primary neurological disorder like frontotemporal dementia. The patients age makes HIV a likely possibility, which can present with cognitive impairment and opportunistic infections like oral candidiasis.C: HIV-related encephalopathy 