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: Gynaecology & Obstetrics
[{'content': 'Which of the following is true regarding lung volumes during pregnancy \nSelect and explain. \nA. Tidal volume is increased., B. FRC Increases., C. Residual volume increases., D. Lung compliance decreases.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: FRC decreases by 30 % during pregnancy. Residual volume decreases. Lung compliance is unchanged during pregnancy.', 'role': 'assistant'}]