This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Absolute proof of monozygosity is determined by 
Select and explain. 
A. DNA finger printing, B. Intervening membrane layers, C. Sex of the babies, D. Reciprocal skin grafting
A: DNA finger printing
Answer: A: DNA finger printing 
Explanation: Zygosity refers to the type of conception and can only be determined by DNA testing. Refer page no 179 of Text book of obstetrics,sheila balakrishnan,2 nd edition.