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
The active component of Bleaching powder is 
Select and explain. 
A. Hypochlorite, B. Hypochlorous acid, C. Hexachlorophane, D. Cetrimide
B: Hypochlorous acid
Answer: B: Hypochlorous acid 
Explanation: Most active is Hypochlorous acid.