This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Cetrimide is 
Select and explain. 
A. Aldehyde, B. Halogen, C. Phenol, D. Quaernary ammonium compounds
D: Quaernary ammonium compounds
Answer: D: Quaernary ammonium compounds 
Explanation: Cetrimide is Quaernary ammonium compounds. Lysol, Cresol derivatives of coal tar are a type of phenols Formaldehyde and glutaraldehyde are aldehydes Iodine and chlorine are halogens Ref : Ananthanarayana textbook of Microbiology 9th edition Pgno : 33