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: Gynaecology & Obstetrics
Mature ovum contains: March 2013 
Select and explain. 
A. 23X, B. 46X, C. 45XO, D. 47XXY
A: 23X
Answer: A: 23X 
Explanation: Ans. A i.e. 23X