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 following parameters increase by 40 percent in pregnancy \nSelect and explain. \nA. Mean arterial pressure, B. Heart rate, C. Cardiac output, D. Diastolic BP', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cardiac output increase by 40% in pregnancy beginning from 5th week and maximum between 28 → 32 weeks.\n70 % increase in cardiac output occurs in immediate post partum period.', 'role': 'assistant'}]