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: Pathology
The chromosomal karyotype in Patau syndrome is - 
Select and explain. 
A. 47)0C,+21, B. 46XX/47)0C+18, C. 45XX,der(14;21), D. 47XX,+13
D: 47XX,+13
Answer: D: 47XX,+13 
Explanation: Ans. is 'd' i.e., 47XX +13