Radiology Obstetrical Ultrasonography in the First Trimester f1874954 T sign is seen in - A Genital TB B Membrane in twin pregnancy C Molar pregnancy D Choriocarcinoma High-Yield Explanation Ans. is 'b' i.e., Membrane in twin pregnancyo 'T sign' refers to appearance of the inter-twin membrane in a monochorionic twin pregnancy.