This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology (Sterilization and Bacterial Genetics), Subject name: Microbiology
Disinfectant used to disinfect blood spills in hospital floors? 
Select and explain. 
A. Phenol, B. Quaernary ammonium compound, C. Alcohol, D. Chlorine based compounds
D: Chlorine based compounds
Answer: D: Chlorine based compounds 
Explanation: MOA of halogens: oxidation of essential sulfhydryl groups of enzymes. Use of Chlorine compounds: * Chlorine tablets are used for water disinfection(water supplies, swimming pools) * Household bleach (5-6 % sodium hypochlorite) - used to disinfect floors in a stock dilution of 1: 10 in water and infectious spills. Use of Iodine compounds * Tincture of iodine (2% iodine in 70% alcohol): used as an antiseptic. * Iodophor- Iodine coated onto a neutral carrier molecules like polyvinylpyrrolidone for slow release and less irritation.Eg. Betadene.