- A FSH, which rises sharply after implantation
- B LH, surging from the anterior pituitary
- C hCG (human chorionic gonadotropin)
- D Progesterone, secreted directly by the placenta
Correct answer: C. hCG (human chorionic gonadotropin)
Explanation: hCG (human chorionic gonadotropin) is produced by the developing placenta after implantation. It is detected in urine and blood by pregnancy tests. hCG maintains the corpus luteum and progesterone production in early pregnancy.
Concept context
Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.