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: Dental
To prevent ventilator associated pneumonia, the most effective and evidence based results are seen with which of the following for critically ill patients: 
Select and explain. 
A. Betadine mouthwash, B. Oral hygiene procedures plus chlorhexidine, C. Manual brushing, D. Powered brushing
B: Oral hygiene procedures plus chlorhexidine
Answer: B: Oral hygiene procedures plus chlorhexidine 
Explanation: None