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: Social & Preventive Medicine
[{'content': 'Which if the statements is false regarding bleaching powder? \nSelect and explain. \nA. 1-3% of bleach can kill most organisms, B. Contains 60% available chlorine, C. Sodium hypochlorite is a versatile disinfectant, D. Lime is used as a stabilizing agent', 'role': 'user'}, {'content': "Answer: B \nExplanation: Bleaching powder contains 33% available chlorine. 1-3% kills most of the organism. Bleach, paicularly sodium hypochlorite, has been shown to react with a microbe's heat shock proteins, stimulating their role as intra-cellular chaperone and causing the bacteria to form into clumps that will eventually die off. In some cases, bleach's base acidity compromises a bacterium's lipid membrane, a reaction similar to popping a balloon. The range of micro-organisms effectively killed by bleach (paicularly sodium hypochlorite) is extensive, making it an extremely versatile disinfectant.", 'role': 'assistant'}]