This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Labour, Subject name: Gynaecology & Obstetrics
Post-term labor is seen in: 
Select and explain. 
A. Hydramnios, B. PID, C. Anencephaly, D. Multiple pregnancy
C: Anencephaly
Answer: C: Anencephaly 
Explanation: Ans. is c, i.e. AnencephalyRef. Dutta Obs. 9/e, 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: Primipara/elderly multipara/H/o 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).