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': 'Weight gain during pregnancy is: March 2012 \nSelect and explain. \nA. 10 kg, B. 12 kg, C. 15 kg, D. 20 kg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B i.e. 12 Kg Weight gain during pregnancy: Reproductive weight gain: 6 Kg (fetus: 3.3 Kg, placenta: 0.6 Kg, liquor: 0.8 Kg, uterus: 0.9 Kg, breasts: 0.4 Kg & accumulation of fat & protein: 3.5 Kg) and Net maternal weight gain: 6 Kg (increase in blood volume: 1.3 Kg & increase in extracellular fluid: 1.2 Kg).', 'role': 'assistant'}]