This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis of Pregnancy, Subject name: Gynaecology & Obstetrics
Fundal height is more than period of gestation in all except: 
Select and explain. 
A. Hydramnios, B. IUD, C. Twin pregnancy, D. Hydatidiform mole
B: IUD
Answer: B: IUD 
Explanation: Ans. is b, i.e. IUDRef. Dutta Obs. 7/e, p 78Condition where the Height of Uterus is more than the Period of Amenorrhea:Mistaken datesTwinsPolyhydramniosBig babyPelvic tumours - Ovarian/fibroidH moleConcealed accidental hemorrhage.Conditions where the Height of Uterus is less than the Period of Amenorrhea:Mistaken datesScanty liquorFetal growth restrictionIntrauterine fetal death.