The diagram shows changes in the structure of the uterus lining during the menstrual cycle in a healthy female. Two regions are labelled Q and R. S shows when ovulation occurs Which row shows the change in hormone levels responsible for the changes shown in the diagram during Q, during R, and for ovulation at S?

Answer:

13) A

During menstruation (Q), progesterone decreases and the uterus lining sheds. R shows when uterus lining builds up. This is when oestrogen increases. S shows ovulation. During ovulation, LH is at its peak.
So the answer is A.