This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics), Subject name: Microbiology
Which of the following statements regarding disinfectant is not true - 
Select and explain. 
A. Hypochlorites are bactericidal and inactivated by organic matter, B. Glutaraldehyde is sporicidal and not inactivated by organic matter, C. Formaldehyde is bactericidal, sporicidal and virucidal, D. Phenol is bactericidal and readily inactivated by organic matter
D: Phenol is bactericidal and readily inactivated by organic matter
Answer: D: Phenol is bactericidal and readily inactivated by organic matter 
Explanation: Phenolic compounds are bactericidal or bacteriostatic and some are fungicidal also. They act by denaturing proteins and disrupting cell membranes. They are effective in the presence of organic material and remain active on surfaces long after application.