<prompt> True regarding pregnancy changes except :Hyperplasia of parathyroidHyperplasia of thyroidIncreased pigmentationDecreased BMR  <response>: 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 : Duttas text book of Obstetrics 7th edition page no 62 