This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Monitoring in Anesthesia, Subject name: Anaesthesia
[{'content': 'Pulmonary changes in lateral position in the anaesthetized patient? \nSelect and explain. \nA. Dependent lung is relatively over ventilated and over-perfused, B. Dependent lung is relatively over ventilated and under-perfused, C. Dependent lung is relatively under ventilated and over-perfused, D. Dependent lung is relatively under ventilated and under-perfused', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In the anaesthetized patient : Dependent lung is relatively under-ventilated and over-perfused Non-dependent lung is over-ventilated and under-perfused. This leads to a generally well tolerated increase in ventilation-perfusion inequality but can cause hypoxaemia in compromised patients.', 'role': 'assistant'}]