This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Embryology 2, Subject name: Anatomy
[{'content': 'In the production of female gametes, which of the following cells can remain dormant for 12-40 years \nSelect and explain. \nA. Primordial germ cell, B. Primary oocyte, C. Secondary oocyte, D. First polar body', 'role': 'user'}, {'content': "Answer: B \nExplanation: Primary oocytes are formed by month 5 of fetal life and remain dormant until pubey, when hormonal changes in the young woman stimulate the ovarian and menstrual cycles. From 5 to 15 oocytes will then begin maturation with each ovarian cycle throughout the woman's reproductive life.", 'role': 'assistant'}]