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': 'During the process of chlorination of water, the disinfecting action of chlorine is due to the formation of- \nSelect and explain. \nA. Hydrochloric acid only, B. Hypochlorous acid only, C. Hydrochloric acid and hypochiorite ions, D. Hypochiorous acid and hypochiorite ions', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Hypochlorous acid and hypochlorite ions", 'role': 'assistant'}]