This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Disinfectant power of chlorine is due to - \nSelect and explain. \nA. Hypochlorous acid, B. Hypochlorite ion, C. Both, D. Chloride ions', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The chlorination kills pathogenic oragnisms. When chlorine is added to water hydrochloric acid and hypochlorous acids are formed The hydrochloric acid is neutralized by alkalinity of water. The disinfecting action of chlorine is due to hypochlorous acid and to small extent due to hypochlorite ions. Parks textbook of preventive and social medicine.K Park. Edition 23.Pg no: 714', 'role': 'assistant'}]