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': 'True about Hematological change in Pregnancy \nSelect and explain. \nA. Total blood volume increases 40% by term, B. The hematocrit increases, C. Red cell volume does not increase until 20 weeks, D. Hematocrit increases due to an increased RBC volume relative to plasma volume', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hemoglobin concentration and Hematocrit decrease slightly during pregnancy.', 'role': 'assistant'}]