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': 'What percentage solution of Cresol is needed for disinfection of faeces and urine? \nSelect and explain. \nA. 5, B. 10, C. 15, D. 20', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Suitable agents for disinfection of faeces and urine 1 Cresol 5% 2 Crude petrol 10% 3 Bleaching powder 5% 4 Formalin 10% 5 Aqua suspension of lime 10 - 20 % Ref: Park, 21st Edition, Page 119', 'role': 'assistant'}]