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
Gloves, syringes, needles etc., used for patients whose HIV test results is not known, should be immersed in - 
Select and explain. 
A. Povidone - iodine 1%, B. Boiling water, C. 1% solution of sodium hypochlorite, D. None
D: None
Answer: D: None 
Explanation: Ans. is 'None' . For contaminated medical instruments 2 % solution of glutaraldehyde is used.