This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sterilization and Disinfection, Subject name: Microbiology
True about hand hygeine - 
Select and explain. 
A. Betadine can cause irritation, B. Alcohol based preparation are used, C. Hot water is best, D. Gluteraldehyde is used
B: Alcohol based preparation are used
Answer: B: Alcohol based preparation are used 
Explanation: Ans. is 'b' i.e., Alcohol based preparation are used o Povidone iodine is the best skin disinfectant o Povidone iodine (Betadine) is less irritant and cause less staining.o Aqueous and alcohol-based povidone iodine preparations are widely used in skin disinfection including preoperative preparation of the skin.o Commonly used skin disinfectants for hand washing are-# Povidone iodine (Betadine) - Best# Chlorhexidine# Isopropyl alcohol