True or False: If the egg does not become fertilized, the lining of the uterus (endometrium) is shed during menstruation.

• A. True
• B. False
• C. Only in some cases
• D. Not applicable

Answer: (A)

The statement is true because when an egg is released from the ovary during ovulation and does not become fertilized, the hormonal signals that maintain the pregnancy do not occur. Consequently, the levels of progesterone decrease, leading to the breakdown of the uterine lining (endometrium). This process is a natural part of the menstrual cycle, wherein the endometrium is shed if implantation of a fertilized egg does not take place. This shedding results in menstrual bleeding, which is a clear indicator of this biological process. Thus, the answer accurately reflects the relationship between fertilization and menstruation.