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
What percentage solution of Cresol is needed for disinfection of faeces and urine? 
Select and explain. 
A. 5, B. 10, C. 15, D. 20
A: 5
Answer: A: 5 
Explanation: 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