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
[{'content': 'Karyotype of complete molar pregnancy is \nSelect and explain. \nA. 46 XX, B. 69 XXX, C. 69 XXY, D. 69 XYY', 'role': 'user'}, {'content': "Answer: A \nExplanation: Complete moles most often have a diploid chromosomal composition. These usually are 46, XX and result from androgenesis, meaning both sets of chromosomes are paternal in origin. The chromosomes of the ovum are either absent or inactivatePaial moles usually have a triploid karyotype .Reference: William's Obstetrics; 25th edition, chapter 20; Gestational trophoblastic diseases", 'role': 'assistant'}]