system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
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
assistant
The correct answer is  The cause of the temperature change at the time of ovulation is probably the increase in progesterone secretion since progesterone is thermogenic.