A woman is most likely to get pregnant if she has unprotected sex a few days before and on the day of ovulation, when the egg is released from the ovaries. The release of the egg is hormonally stimulated,meaning that a hormone in the woman’s body triggers ovulation. On average, women ovulate around the 14th day of their menstrual cycle. The following is a graph show- ing the levels of three hormones throughout the menstrual cycle of an average woman.

Based on the graph, which hormone is most directly responsible for triggering ovulation?



The graph shows that the level of LH rapidly rises right before the 14th day of the cycle, and then falls.

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