This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'All the following agents can be used as skin disinfectants, except \nSelect and explain. \nA. Chloroxylenol, B. Tincture iodine, C. Quaternary ammonium compounds, D. Isopropyl alcohol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chloroxylenol - Phenol. Tincture iodine - Halogen, Isopropyl alcohol - Alcohol Ref : Ananthanarayana textbook of Microbiology 9th edition Pgno : 33', 'role': 'assistant'}]