This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
[{'content': 'Blood spill disinfection by: \nSelect and explain. \nA. Isopropyl alcohol, B. Hypochlorite, C. Formalin, D. Glutaraldehyde', 'role': 'user'}, {'content': "Answer: B \nExplanation: ANS. B# Spaulding's classification for sterilization1. Critical, e.g. heart lung machine, scalpel (contact with blood)2. Semicritical, e.g. endoscopes3. Noncritical, e.g. stethoscope, BP cuff, plasters.Method of sterilization1. Critical: Autoclave/ethylene oxide2. Semicritical: 2% glutaraldehyde for 20 minutes3. For plastic tubes: Gamma rays", 'role': 'assistant'}]