The main function of the reproductive/menstrual cycle is to stimulate growth of a follicle to release an egg and prepare for implantation if fertilization occurs.

• A. To regulate hormones of the cycle
• B. To stimulate the growth of a follicle to release an egg and prepare for implantation if fertilization occurs.
• C. To trigger ovulation only
• D. To maintain endometrial dryness

Answer: (B)

The cycle’s purpose is to prepare the body for possible pregnancy by coordinating egg development, ovulation, and the changes in the uterine lining that would allow implantation if fertilization occurs. The described option fits this best because it captures the key sequence: growth of a follicle to release an egg (ovulation) and the uterus being prepared for implantation if fertilization happens. Hormonal signals regulate and drive these steps—FSH and estrogen promote follicle growth and endometrial thickening, LH triggers the egg release, and progesterone from the luteal phase helps maintain the lining for potential implantation.

Other choices aren’t as complete: regulating hormones is part of how the cycle works but doesn’t state the end goal; triggering ovulation alone omits the necessary luteal support and endometrial preparation; maintaining endometrial dryness is opposite to what the cycle achieves, since the lining thins and sheds if pregnancy doesn’t occur.