Wilma who is in the second trimester of her pregnancy visits her doctor. The doctor conducts a test on her blood to measure the level of alpha-fetoprotein. Which of the following tests is conducted on Wilma?

A) chorionic villus sampling
B) neural tube defect screening
C) amniocentesis
D) cystic fibrosis carrier screening

The test conducted on Wilma is neural tube defect screening, which measures the level of alpha-fetoprotein in her blood. Chorionic villus sampling and amniocentesis are invasive tests used to diagnose genetic disorders in the fetus, while cystic fibrosis carrier screening is a test used to determine if an individual is a carrier for the genetic disorder cystic fibrosis.