This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The germ cells are derived from \nSelect and explain. \nA. Yolk sac, B. Amnion, C. Germinal epithelium, D. Allantois', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Germ cells developed from yolk sac epiblast(ectoderm). Ref: Human embryology; Inderbir Singh; Tenth edition', 'role': 'assistant'}]