Microbiology General c3df5528 Feces are disinfected best by ? A 1% formaldehyde B 5% cresol C 5% phenol D Isopropyl alcohol High-Yield 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".