<prompt> Post-term labor is seen in:HydramniosPIDAnencephalyMultiple pregnancy  <response>: Ans. is c, i.e. AnencephalyRef. Dutta Obs. 9e, p 299Causes of Post-term pregnancy:Wrong dates: Due to inaccurate LMP most common.Biologic variability Hereditary may be seen in the family.Maternal factors: Primiparaelderly multiparaHo previous prolonged pregnancy, sedentary habit.Fetal factors: Congenital anomalies: Anencephaly - Abnormal fetal HPA axis, adrenal hypoplasia Diminished fetal cortisol response.Placental factors: Sulphatase deficiency Low estrogen. 