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
Which of the following is not true regarding bleaching powder – 
Select and explain. 
A. Contact period is one hour, B. Volume of water is estimated, C. Immediatly dissolved in water, D. Chlorine demand is estimated
C: Immediatly dissolved in water
Answer: C: Immediatly dissolved in water 
Explanation: None