The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A researcher conducts multiple experiments to establish an infection and disease model for Clostridium perfringens in chickens. To ensure that all instruments are free of the pathogenic organism, he uses a disinfectant that oxidizes and denatures proteins. Which of the following disinfectants did the researcher most likely use?   (A) Chlorine dioxide   (B) Isopropyl alcohol   (C) Povidone-iodine   (D) Benzalkonium chloride
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