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
Disinfecting action of chlorine is due to: 
Select and explain. 
A. Hypochlorous acid, B. Hypochlorite ion, C. Hypochloric acid, D. Chloride radical
A: Hypochlorous acid
Answer: A: Hypochlorous acid 
Explanation: Hypochlorous acid