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: Anaesthesia
Which of the following prevents aspiration? 
Select and explain. 
A. LMA, B. Oropharyngeal airway, C. Nasopharyngeal airway, D. Proseal LMA
D: Proseal LMA
Answer: D: Proseal LMA 
Explanation: Ans. is 'd' i.e., Proseal LMA [Ref: Understanding Paediatric Anaesthesia Td/e p. 141A type of definite airwayDefinite airway is an airway that is adequately secured in trachea and it adequately protect the airway from aspiration.ProSeal (PLMA), a modification of Classic LMA, has a gastric drainage tube placed lateral to main airway tube which allows the regurgitated gastric contents to bypass the glottis and prevents the pulmonary aspiration.