<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A previously healthy 21-year-old man comes to the physician for the evaluation of lethargy, headache, and nausea for 2 months. His headache is holocephalic and most severe upon waking up. He is concerned about losing his spot on next seasons college track team, given a recent decline in his performance during winter training. He recently moved into a new house with friends, where he lives in the basement. He does not smoke or drink alcohol. His current medications include ibuprofen and a multivitamin. His mother has systemic lupus erythematosus and his father has hypertension. His temperature is 37C 98.6F, pulse is 80min, respirations are 18min, and blood pressure is 12275 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 98. Physical examination shows no abnormalities. Laboratory studies show:Hemoglobin 19.6 gdLHematocrit 59.8Leukocyte count 9,000mm3Platelet count 380,000mm3Which of the following is the most likely cause of this patients symptoms?? A: Chronic cerebral hypoxia, B: Increased intracranial pressure, C: Exogenous erythropoietin, D: Inherited JAK2 kinase mutation, E: Overuse of NSAIDs,  <response>: This is a clinical case scenario about a previously healthy 21-year-old male presenting with symptoms of lethargy, headache, and nausea for 2 months. The key findings in the history are:- Holocephalic headache worse on waking up - Decline in athletic performance - Lives in a basement apartment- No smoking or alcohol use- Family history of autoimmune disease and hypertension- Vital signs are normal- Physical exam is unremarkable- Labs show high hemoglobin, hematocrit, normal WBC and plateletsThe elevated hemoglobin and hematocrit along with the other clinical findings are most consistent with chronic carbon monoxide poisoning leading to cerebral hypoxia. Living in a basement apartment puts him at risk for CO exposure. The headache and cognitive symptoms fit with CO toxicity. The choices can be narrowed down to chronic cerebral hypoxia versus increased intracranial pressure based on the clinical presentation. The lab findings confirm chronic hypoxia as the most likely diagnosis.A: Chronic cerebral hypoxia 