<prompt> Which of the following is a cause of decreased maternal serum a protein -Neural tube defectsFetal demiseHepatitisAneuploidy  <response>: Maternal serum a - Fetoprotein Decreased Maternal Serum a fetoprotein Twins Neural tube defects Intestinal atresia Hepatitis Nephrosis Fetal demise Incorrect gestational age Trisomies Aneuploidy 