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
[{'content': 'The active component of Bleaching powder is \nSelect and explain. \nA. Hypochlorite, B. Hypochlorous acid, C. Hexachlorophane, D. Cetrimide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most active is Hypochlorous acid.', 'role': 'assistant'}]