<prompt> Oligohydramnios isare associated with:a Neural tube defectb Renal agenesisc Postmature birthd Premature birthacbcad  <response>: Causes of oligohydramnios:Mnemonic: Dil Mein Ppaar read as pyaarDilDrug Prostaglandin synthetase inhibitors and ACE inhibitors. IUGR Leaking of fluid following amniocentesis or chorionic villus sampling.MeinMaternal conditions like hypertension and preeclampsia.PpaarPostterm pregnancyPremature rupture of membraneAbruptio-chronicAmnion Nodosum. and chromosomal anomaly like triploidyRenal anomalies of fetusleading to decreased urine production:Renal agenesisUrethral obstruction Posterior urethral valvePrune-Belly syndromeBilateral multicystic dysplastic kidneys. 