Which is TRUE during the luteal phase of the menstrual cycle?
A. Estrogen concentration remains low, while progesterone concentration rises to a peak.
B. Progesterone concentration in the plasma is high, but estrogen concentration rises even higher.
C. Estrogen concentration in the plasma is high, but progesterone concentration rises even higher.
D. Both estrogen and progesterone concentrations are kept low by negative feedback.
E. Progesterone concentration remains low, while estrogen concentration rises to a peak.
Answer: C
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