Answer: ovulation.
- A ovulation
- B menstruation
- C fertilisation
- D implantation
Correct answer: A. ovulation
Explanation: Ovulation is the release of the egg from the ovary, around mid-cycle.

The human male reproductive system: sperm formed in the testis mature in the epididymis and travel via the vas deferens, mixing with secretions of the seminal vesicle, prostate and bulbourethral glands. Image: Wumingbai, CC BY-SA 4.0, via Wikimedia Commons.
Concept context
Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.