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:  Although TCDD was largely below the detection limits in this small pilot sample , the two boys with detectable values had high TCDD levels ( 17 . 9 and 21 . 7 pg / g lipid ) , suggesting that exposure for at least some portion of this population is substantially higher than typical of this age group .
A: 
sample