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: Biochemistry
[{'content': 'Quaernary ammonium compound disinfectants are ? \nSelect and explain. \nA. Anionic, B. Cationic, C. Neutral, D. Gases', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Quaternary ammonium compounds are cationic detergents. They have microcidal and viricidal activities. They can be used for instrument disinfection and skin antisepsis.', 'role': 'assistant'}]