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 is an intermediate level disinfectant? 
Select and explain. 
A. Glutaraldehyde, B. Quaternary ammonium compound, C. Hydrogen peroxide, D. Iodophores
D: Iodophores
Answer: D: Iodophores 
Explanation: Intermediate level disinfectants are chemicals which can kill microbial pathogens including mycobacteria and non enveloped virus, but not the spores. Examples include alcohol, phenolic compounds and iodophors. Glutaraldehyde and hydrogen peroxide are high level disinfectants. Quaternary ammonium compounds are low level disinfectants.