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
The double decidual sac sign (DDSS) is the best method for ultrasound diagnosis of 
Select and explain. 
A. Monoamniotic Dichorionic twins, B. Diamniotic dichorionic twins, C. Ectopic pregnancy, D. Normal pregnancy
D: Normal pregnancy
Answer: D: Normal pregnancy 
Explanation: Double decidual sac sign on USG - Intra-uterine sac (Eccentrically placed) Outer layer - Decidua Parietalis Inner layer - Decidua Capsularis Indicates - Intrauterine pregnancy Intradecidual ring sign is the first sign of pregnancy on USG.