A 26 year old woman with 32-day menstrual cycle planning for conception regularly checks her body temperature (orally) using a digital thermometer in the morning before getting out of bed. She noticed an increase in her body temperature on the 18th day of menstrual cycle. This is caused by: (A) Oestradiol, (B) Progesterone, (C) LH peak, (D) FSH peak
Answer is B. The cause of the temperature change at the time of ovulation is probably the increase in progesterone secretion since progesterone is thermogenic.