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
True about hand hygiene- 
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: Povidone-iodine is the best skin disinfectant
Povidone-iodine (Betadine) is less irritant and cause less staining.
Aqueous and alcohol-based povidone-iodine preparations are widely used in skin disinfection including preoperative preparation of the skin.
Commonly used skin disinfectants for hand washing are- □ Povidone-iodine (Betadine)

→ Best  Chlorhexidine
□ Isopropyl alcohol