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
Which of the following statement regarding disinfectants in 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: Phenol exe microcidal activity by injuring lipid containing plasma membrane, which results in leakage of cellular contents. They remain active in presence of organic compounds, they are stable and persists for long period after application. Ref: Toora (2008), Chapter 7, "The control of microbial growth", In the book,"Microbiology: An Introduction" 9th Edition, India, Page 198; Textbook of Microbiology By Ananthnarayananan, 7th Edition, Pages 30-32; Medical Microbiology By Jawetz, 24th Edition, Page 61