You are answering a USMLE-style medical question. Question: A 20-year-old woman in the army recruit collapses during an especially hot day at basic training. She was in her normal excellent state of health prior to this event. Two weeks ago, she had an upper respiratory infection (URI) but has since recovered. Her father has chronic kidney disease (CKD), bilateral hearing loss, and vision problems. At the hospital, her temperature is 40.3°C (104.5°F), blood pressure is 85/55 mm Hg, pulse is 105/min, and respiratory rate is 24/min. On physical exam, the patient appears to have altered mental status and her skin is dry, hot, and erythematous. She is complaining of severe bilateral flank pain and generalized myalgia. Catheterization produces 200 mL of tea-colored urine. Urine dipstick is positive for blood, but urinalysis is negative for RBCs or WBCs. Which of the following is most likely responsible for her condition? Options: A) A mutation of the COL4A5 gene B) Neisseria meningitides C) Heat stroke D) IgA nephropathy Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.