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
Fertilization is complete when 
Select and explain. 
A. 1st polar body is formed, B. 2nd polar body is formed, C. Primary oocyte is formed, D. Secondary oocyte is formed
B: 2nd polar body is formed
Answer: B: 2nd polar body is formed 
Explanation: Polar body - 2 - rarely formed, formed only during fertilization.