Lulu is 53 and has not had her menstrual period in a year. Several times a day, she feels a tingling in her upper chest, and then heat washes over her, in an upward direction. It is intensely uncomfortable for about 5 minutes, during which she is nearly overwhelmed with an urge to fling off her clothing. The cause of Lulu's hot flashes is
A. a decrease in gonadotropin concentration and an increase in estrogen concentration.
B. an increase in gonadotropin concentration and an increase in estrogen concentration.
C. a decrease in gonadotropin concentration and a decrease in estrogen concentration.
D. an increase in gonadotropin concentration and a decrease in estrogen concentration.
Answer: D
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