General Medicine General 76e28066 During her eighth month of pregnancy, a 29-year-old woman is noted to have polyhydramnios. Further testing shows anencephalus. Polyhydramnios in this patient is caused by which of the following? A Impairment of the fetus's swallowing mechanism B Tumor of the fetus's brain C A secretory peptide from the placenta D Excess antidiuretic hormone (ADH) from the fetus