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': 'Increase in cardiac output seen in pregnancy is: March 2010 \nSelect and explain. \nA. 10%, B. 20%, C. 30%, D. 40%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: 40% The cardiac output stas to increase from 5t1 week of pregnancy and reaches its peak 40-50% at about 30-34 weeks. Cardiac output increase fuher during labour (+50%) and immediately following delivery (+70%)', 'role': 'assistant'}]