The changes in concentration of hormones in a healthy woman’s blood were monitored during several menstrual cycles.
During which stage of the menstrual cycle was the concentration of oestrogen falling, the concentration of luteinising hormone (LH) and follicle-stimulating hormone (FSH) maximal and the progesterone concentration rising?
A. at the start of menstruation
B. at the end of menstruation
C. four days before ovulation and the time of ovulation
D. after ovulation but before the start of menstruation
E. between the end of menstruation and four days before ovulation