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
For Karyotype analysis of stillborns, recommended tissue sample is all except 
Select and explain. 
A. Umbilical cord segment about 1.5 cm long, B. Fetal patella, C. Placental block taken below cord insertion, D. Fetal skin
D: Fetal skin
Answer: D: Fetal skin 
Explanation: Skin of Fetus is not recommended as tissue sample for karyotyping.