This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sterilization and Disinfection, Subject name: Microbiology
Feces are disinfected best by - 
Select and explain. 
A. 1% formaldehyde, B. 5% cresol, C. 5% phenol, D. Isopropyl alcohol
B: 5% cresol
Answer: B: 5% cresol 
Explanation: Ans. is 'b' i.e., 5% cresol "The most effective disinfectant for general use is a coal-tar disinfectant with a Rideal-Walker (RW) coefficient of 10 or more such as cresol ".- Park 250Agents suitable for disinfection of faeces and urineDisinfectantAmount per litrePercent1 Bleaching powder2 Crude phenol3 Cresot4 Formalin50g100 ml50 ml100 ml510510