- A luteinising hormone (LH)
- B the hormone insulin
- C the hormone thyroxine
- D the hormone adrenaline
Correct answer: A. luteinising hormone (LH)
Explanation: A mid-cycle surge of LH triggers the release of the egg from the ovary.
Concept context
Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.