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: Surgery
[{'content': 'In which phase of respiration is measurement of intravascular pressure by a pulmonary aery catheter done? \nSelect and explain. \nA. At the end of expiration, B. At peak of inspiration, C. During mid inspiration, D. During mid expiration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: To eliminate the effects of intrathoraic pressure on pulmonary capillary wedge pressure values, atrial pressure is measured at the end expiration during which there is no movement of air in and out of thorax. Ref: Critical Care Transpo By American Academy of Ohopaedic Surgeon, Page 580', 'role': 'assistant'}]