This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, 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: Venous air embolism is a potential hazard whenever the operative site is above the level of patients hea The "sitting" position and its modification "beach chair" position are associated with a greater incidence of venous air embolism Ref : ncbi.nlm.nih.gov/pmc/aicles/PMC2580000', 'role': 'assistant'}]