This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'True regarding pregnancy changes except : \nSelect and explain. \nA. Hyperplasia of parathyroid, B. Hyperplasia of thyroid, C. Increased pigmentation, D. Decreased BMR', 'role': 'user'}, {'content': "Answer: D \nExplanation: There is rise in the basal metabolic rate, which begins at about the third month, reaches a value of +25% during the last trimester. The increase in BMR is probably due to increase in net oxygen consumption of mother and fetus. Reference : Dutta's text book of Obstetrics 7th edition page no 62", 'role': 'assistant'}]