Pathology All of the following are true statements about Down syndrome, except: A Most common inheritable cause of mental retardation B In quadruple test, Inhibin-A level is reduced C Most common cause is meiotic non-disjunction D In triple test (AFP |, estriol |, hcG |) 💡 Explanation All of the following are true statements about Down syndrome, except: ✓ Correct Answer: B. In quadruple test, Inhibin-A level is reduced