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': 'Feilization is complete when \nSelect and explain. \nA. 1st polar body is formed, B. 2nd polar body is formed, C. Primary oocyte is formed, D. Secondary oocyte is formed', 'role': 'user'}, {'content': "Answer: B \nExplanation: At feilization, the secondary oocyte complete meiosis 2 to form a mature oocyte and a second polar body Ref: Gray's 39e/p-210-220", 'role': 'assistant'}]