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
[{'content': 'Absolute proof of monozygosity is determined by: \nSelect and explain. \nA. DNA finger printing, B. Intervening membrane layers, C. Sex of the babies, D. Reciprocal skin grafting', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most definite proof of monozygosity is DNA finger printing by DNA microprobe technique.\nSummary of Determination of Zygosity', 'role': 'assistant'}]