This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pulmonary Embolism, Subject name: Surgery
Venous air embolism is most common in which position in surgery - 
Select and explain. 
A. Sitting, B. Prone, C. Lateral, D. Lithotomy
A: Sitting
Answer: A: Sitting 
Explanation: Ans, is 'a' i.e., Sitting o Venous air embolism is a potential hazard whenever the operative site is above the level of patients heart,o The 'sitting' position and its modification "beach chair" positions are associated with a greater incidence of venous air embolism.