This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Hormones, Subject name: Physiology
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: Ans. is 'b' i.e., 2nd Polar body is formed "As soon as a spermatozoon enters the ovum, the lather finishes its second meiotic division and the second polar body is formed" - I.B. Singh