<prompt> What is this appearance - seen in early pregnancy known as:AIIMS 2016Yolk sac signDouble decidual sac signDouble bleb signTwin peak sign  <response>: 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. 