<prompt> Oligohydramnios is associated withRenal agenesisNeural tube defectsPostmature birthPremature birth  <response>: Etiology of oligohydramnios: Intrauterine growth restrictionPost-term pregnancy Premature rupture of membrane Drugs like ACE inhibitors and prostaglandin inhibitors Renal anomalies Renal Agenesis Infantile polycystic disease Upper urinary tract obstructions Lower urinary tract obstructions 