A woman wishes to have her unborn child tested for genetic disorders and see a full karyotype of her child's genome but does not want to have the amniotic sac punctured to retrieve samples. Which of the following tests will give the most accurate and thorough examination of the fetal genome without puncturing the amniotic sac to retrieve fetal DNA?
A. Ultrasonography
B. Maternal serum marker screening
C. Amniocentesis
D. Chorionic villus sampling
Answer: D
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