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': 'Disinfecting action of chlorine is due to ? \nSelect and explain. \nA. Hypochlorous acid, B. Hypochlorite ion, C. Hydrochloric acid, D. Both Hypochlorous acid and Hypochlorite ion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]