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': 'For Karyotype analysis of stillborns, recommended tissue sample is all except \nSelect and explain. \nA. Umbilical cord segment about 1.5 cm long, B. Fetal patella, C. Placental block taken below cord insertion, D. Fetal skin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Skin of Fetus is not recommended as tissue sample for karyotyping.', 'role': 'assistant'}]