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': 'Cardiac output during pregnancy is maximal at : \nSelect and explain. \nA. 32nd week, B. 36th week, C. 24th week, D. 12th week', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 32nd week', 'role': 'assistant'}]