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: Microbiology
Sputum can be disinfected by all except - 
Select and explain. 
A. Autoclaving, B. Boiling, C. Cresol, D. Chlorhexidine
D: Chlorhexidine
Answer: D: Chlorhexidine 
Explanation: None