In this task, you are given a sentence. You are expected to write the name of the organism substances in the body mentioned in the input. Although there might be several correct answers, you need to write one of them.

Q:  The use of these biological samples was approved by local ethical committee .

A: samples
****
Q:  QTcF interval versus plasma linezolid concentrations .

A: plasma
****
Q:  Fetal Down syndrome was diagnosed by karyotyping of amniotic fluid cells .

A:
fluid
****