This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Radiology
What is this appearance - seen in early pregnancy known as:(AIIMS 2016) 
Select and explain. 
A. Yolk sac sign, B. Double decidual sac sign, C. Double bleb sign, D. Twin peak sign
C: Double bleb sign
Answer: C: Double bleb sign 
Explanation: Ans. C Double bleb signAntenatal ultrasound image in first trimester - termed as the double bleb signQ. It is formed by Amnion and Yolk sac and is seen between 5 to 6 weeks. It corresponds with the appearance of the fetal poleQ - tiny dot seen between the two blebs.