This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Social & Preventive Medicine
[{'content': 'Which among the following is an active form of chlorination? \nSelect and explain. \nA. Hypochlorite ion, B. Hydrogen chloride, C. Hypochlorous acid, D. Chloride ion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: * The disinfecting action of chlorine is predominantly due to hypochlorous acid. * Hypochlorous acid is most effective form of chlorine and it is almost 70-80 times more effective than hypochlorite ions ref : park 21st ed', 'role': 'assistant'}]