This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Fertilization 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: Polar body - 2 - rarely formed, formed only during fertilization.', 'role': 'assistant'}]