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
[{'content': 'Venous air embolism is most common in which position in surgery - \nSelect and explain. \nA. Sitting, B. Prone, C. Lateral, D. Lithotomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]