This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fertilization and Development of Embryo, Subject name: Anatomy
[{'content': 'Primordial Germ cell develops from? \nSelect and explain. \nA. Chorion, B. Amnion, C. Yolk sac, D. Cord blood', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ANSWER: (C) Yolk sacREF: Embryology by Ramesh Mathur,Meenakshi Mehta page-38, Color atlas of embryology by Ulrich Drews page 15"In mammalian embryo, including man, the primordial germ cells apparently arise from the en do dermal layer near the yolk sac"\'Germ cells arise in the embryonic yolk sac, differentiate in the gonads and pass on the genome as gametes"', 'role': 'assistant'}]