<prompt> A multigravida at 35 weeks gestation had the following finding on ultrasound. The following can be the causes except:DiabetesPosterior urethral valveRh alloimmunizationAnencephaly  <response>: Ans. B. Posterior urethral valvePolyhydramnios is diagnosed when the AFI 24cm or the single deepest pocket measures 8cm.Causes of polyhydramnios:a. MC cause of mild polyhydramnios idiopathicb. Multifetal pregnancyc. Maternal diabetesd. Cleft lippalate GIT anomalies NTDe. Esophageal atresiaduodenal atresiaf. Anencephalyg. Chorangioma of placentah. Hydrops fetalis Rh alloimmunizationi. TORCHj. Trisomyk. sacrococcygeal teratoma 