This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Urine analysis of patient suffering from heatstroke reveals: \nSelect and explain. \nA. Isomorphic red cells, B. Red cell casts, C. Hemosiderin, D. Hyaline cast', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Patients with exertional heatstroke (EHS), in contrast to those with CHS, are often young and previously healthy, and their diagnosis is usually more obvious from the history. Athletes, laborers, and military recruits are common victims. Unlike those with CHS, many EHS patients present profusely diaphoretic, despite significant dehydration. As a result of muscular exertion, rhabdomyolysis and acute renal failure are more common in EHS. Studies to detect rhabdomyolysis and its complications, including hypocalcemia and hyperphosphatemia, should be considered. Hyponatremia, hypoglycemia\xa0and coagulopathies are frequent findings. Elevated creatine kinase and lactate dehydrogenase levels also suggest EHS. Oliguria is a common finding. Renal failure can result from direct thermal injury, untreated rhabdomyolysis\xa0or volume depletion. Common urinalysis findings include microscopic hematuria, myoglobinuria, and granular or red cell casts.\xa0\n\xa0\nHarrison Principles of Internal Medicient Ed 19 Pg 479e3', 'role': 'assistant'}]