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: Microbiology
All are true regarding disinfectants except aEUR' 
Select and explain. 
A. Glutaraldehyde is sporicidal, B. Hypochlorites are virucidal, C. Ethylene oxide is intermediate disinfectant, D. Phenol usually requires organic matter to act
D: Phenol usually requires organic matter to act
Answer: D: Phenol usually requires organic matter to act 
Explanation: Phenol is bactericidal and readily inactivated organic matter Phenols are bactericidal, but these are not readily inactivated by organic matter. Disinfectant Effective against Susceptible to organic matter Bacteria Spores Virus Formaldehyde +++ +++ +++ - Glutaraldehyde +++ +++ +++ ? Chlorine (hypochlorite) +++ +1- +++ +++ Phenols ++(+) - + +/-