This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Gynaecology & Obstetrics
[{'content': 'Double decidual sign is seen in? \nSelect and explain. \nA. Uterine gestational sac, B. Pseudo gestational sac, C. Threatened Aboion, D. Ectopic pregnancy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Double decidual sign is seen in Uterine gestational sac Double decidual sac sign on USG - Intra-uterine sac (Eccentrically placed) Outer layer - Decidua Parietalis Inner layer - Decidua Capsularis Indicates - Intrauterine pregnancy', 'role': 'assistant'}]