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
During water analysis in a hostel, amoebic cysts were seen. The best step to manage it is ? 
Select and explain. 
A. Iodine, B. Boiling, C. U.V Rays, D. Chlorination
A: Iodine
Answer: A: Iodine 
Explanation: Ans. is "a' i.e., Iodine "Amoebic injection is spread by ingestion ref food or water contaminated with cysts. since an asymptomatic carrier may excrete upto 15 million cysts/day. Prevention of infection requires adequate sanitation and eradication of cyst carriage. In high risk areas infection can he minimized by avoidance of unpeeled fruits and the use of Bottled water o Because cysts are resistant to readily attainable levels of chlorine, disinfection by iodination (Tetraglycine hyperiodide) is recomtnended." - Harrison