Gynaecology & Obstetrics Function of inhibin: A Inhibin A/B is useful tumor marker for Sertoli-Leydig tumors. B Inhibin-B Produces positive feedback for FSH C Inhibin-A decreases in trisomy 21 (Down syndrome) D Inhibin-A decreases in trisomy 18 (Edwards syndrome) 💡 Explanation Function of inhibin: ✓ Correct Answer: D. Inhibin-A decreases in trisomy 18 (Edwards syndrome)