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': 'Oogonia are derived from \nSelect and explain. \nA. Yolk sac, B. Germinal epithelium, C. Chorion, D. Mesoderm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Inderbir Singh&;s; Human Histology; Seventh edition; Pg 346The stem cells from which ova are derived are called Oogonia. These are large round cells present in the coex of the ovary. Oogonia are derived from the primordial germ cells that are formed in the region of the yolk sac and migrate into the developing ovary', 'role': 'assistant'}]