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
Disinfection of sputum is done by - 
Select and explain. 
A. Boiling, B. Autoclaving, C. Burning, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., Boiling; 'b' i.e., Autoclaving; 'c' i.e., Burning