This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'The amount of bleaching powder necessary to disinfect choleric stools, is- \nSelect and explain. \nA. 50gm/lit, B. 75 gm/lit, C. 90 gm/it, D. 100 gm/ lit', 'role': 'user'}, {'content': "Answer: A \nExplanation: Bleaching powder or chlorinated lime is a white amorphous powder with a pungent smell of chlorine. It kills most of the organisms when used in a strength of 1 to 3 percent. A 5 percent solution is suitable for the disinfection of feces and urine allowing a period of one hour. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 141", 'role': 'assistant'}]