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Q There is a mid-cycle shift in the basal body temperature (BBT) after ovulation in women. This is caused by:
A. FSH-peak
B. LH-peak
C. Oestradiol
D. Progesterone

Ans: d. Progesterone

The cause of the temperature change at the time of ovulation is probably the increase in progesterone secretion, since progesterone is thermogenic.

(Ref: Ganongs Review of Physiology 25th/e p402)