This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics), Subject name: Microbiology
[{'content': 'Sputum can be disinfected by all except \nSelect and explain. \nA. Autoclaving, B. Chlorhexidine, C. Boiling, D. Cresol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Autoclaving is the safest and most effective method for sputum disinfection Incineration is an effective alternative. Boiling used after an initial disinfection by 5% phenol (carbolic acid) or its derivatives like Lysol and Cresol.', 'role': 'assistant'}]