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 is not used as a disinfectant? 
Select and explain. 
A. 1-2% Cetrimide, B. 100% Alcohol, C. 2% Lysol, D. 5% Chloroxylene
B: 100% Alcohol
Answer: B: 100% Alcohol 
Explanation: A 70% solution of alcohol takes more time in evaporation from the surface, increasing the contact time. Therefore, 70% isopropyl alcohol is suitable for disinfection. 
100% isopropyl alcohol coagulates the protein instantly creating a protein layer that protects the remaining protein from further coagulation.