This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Karyotyping of fetus can be done by all Except \nSelect and explain. \nA. Chorionic villus sampling, B. Cordocentesis, C. Amniocentesis, D. Fetal skin biopsy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Karyotyping is a test to examine chromosomes in a sample of cells. This test can help identify genetic problems as the cause of a disorder or disease. In utero sampling of fetal skin, liver, and muscle may be required to diagnose before-bih disorders that cannot be diagnosed by analysis using chorionic villi or amniotic fluid. Refer robbins 158', 'role': 'assistant'}]