You are answering a USMLE-style medical question. Question: A 21-year-old man is brought to the emergency department 30 minutes after being found unconscious in his apartment by his mother. On arrival, he is unable to provide history. The mother reports that there is no history of serious illness in the family. The patient appears drowsy and dehydrated. His temperature is 38.5°C (101.3°F), pulse is 110/min, and blood pressure is 170/100 mm Hg. Examination shows several track marks on his forearms and large contusions over his forehead, legs, and back. There is blood coming from the mouth. The patient is catheterized and tea-colored urine is drained. Urinalysis shows: Urine pH 5.8 Specific gravity 1.045 Blood 3+ Glucose 3+ Proteins 1+ Ketones 1+ RBC none WBC 0-1/hpf Urine toxicology is positive for opiates and cocaine. Intravenous fluids and sodium nitroprusside drip are started. The patient is most likely to have which of the following?" Options: A) Low serum potassium B) Low blood urea nitrogen C) Elevated serum calcium D) Elevated serum creatine kinase Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.