system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In evaluating the menstrual cycle, which is TRUE?
assistant
The correct answer is  The proliferative (follicular) phase (estrogen) is between the first days of menstrual bleeding to ovulation. If fertilization does not take place, progesterone release results in the endometrial proliferative phase. FSH stimulates the cycle of follicular proliferation.