<prompt> Sacrococcygeal teratoma is due to:Primitive streakNotochordClosure of caudal neuroporeCloacal membrane  <response>: Ans. a. Primitive streakSACROCOCCYGEAL TERATOMA STIt is the most common germ cell tumor of childhood.Sacrococcygeal teratoma ST is a tumor that arises from remnants of the primitive streak, which normally degenerates and disappears.Sacrococcygeal teratomaIt is derived from pluripotent cells of the primitive streak and often contains various types of tissue e.g., bone, nerve, hair.It occurs more commonly in female infants and usually becomes malignant during infancy must be surgically removed by age 6 months. 