This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development period- week 1,2,3,4, Subject name: Anatomy
Sacrococcygeal teratoma is a derivative of 
Select and explain. 
A. Primitive streak, B. Hypoblast, C. Ectoderm, D. Cranial neuropore
A: Primitive streak
Answer: A: Primitive streak 
Explanation: Sacrococcygeal teratoma: - Sometimes remnants of the primitive streak persist in the sacrococcygeal region. Then cluster of pluripotent cells proliferate & form tumor, known as sacrococcygeal teratomas Which commonly contain tissues derived from all three germ layers. Occurrence 1: 37,000 Most common tumor in a new born. Teratomas may also arise from abberent migration of primordial germ cells.