In the development of mature ova, which stage directly precedes the corpus luteum?

• A. Mature
• B. Corpus albicans
• C. Antral
• D. Primary

Answer: (A)

The stage just before the corpus luteum forms is the mature (Graafian) follicle. As ovulation approaches, the follicle reaches this mature state, and when the oocyte is released, the remaining follicular tissue undergoes luteinization to become the corpus luteum. This structure then secretes progesterone to support the uterine lining in early pregnancy. If pregnancy doesn’t occur, the corpus luteum degenerates into the corpus albicans. The other options refer to earlier follicle stages (primary and antral) or to the degenerative end product (corpus albicans), not to what directly becomes the corpus luteum.