You are answering a USMLE-style medical question. Question: Four days after admission to the hospital for pneumonia, a 68-year-old woman develops abdominal pain and watery, foul-smelling diarrhea. Current medications include intravenous ceftriaxone and oral azithromycin. Stool cultures grow gram-positive, anaerobic rods. She is moved to an isolated hospital room. Sterilization with which of the following agents is most likely to prevent transmission of this pathogen to the next patient who will occupy her room? Options: A) Chlorine-based solution B) Iodine-based solution C) Isopropanol-based solution D) Quaternary amine-based solution Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.