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: Social & Preventive Medicine
[{'content': 'Sputum can be sterilized by all of the following, EXCEPT: \nSelect and explain. \nA. Chlorhexidine, B. Cresol, C. Boiling, D. Autoclaving', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sputum can be disinfected using: 5% cresol Burning Boiling Autoclaving Ref: Park 21st edition, page 119.', 'role': 'assistant'}]