This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Disinfectance used for blood spills 
Select and explain. 
A. Phenol, B. Glutaraldehyde, C. Ethanol, D. Sodium hypochlorite
D: Sodium hypochlorite
Answer: D: Sodium hypochlorite 
Explanation: Hypochlorites are most widely used chlorine disinfectant. Liquid form: sodium hypochlorite Household bleach Broad-spectrum of antimicrobial activities Do not leave toxic residues Unaffected by water hardness Inexpensive and fast-acting Remove dried or fixed organisms and biofilm a from surfaces (refer pgno:129 park 23 rd edition)